Novel bone mineralization proteins, DNA, vectors expression systems

ABSTRACT

The present invention is directed to isolated nucleic acid molecules that encode LIM mineralization protein, or LMP. The invention further provides vectors comprising nucleotide sequences that encode LMP, as well as host cells comprising those vectors. Moreover, the present invention relates to methods of inducing bone formation by transfecting osteogenic precursor cells with an isolated nucleic acid molecule comprising a nucleotide sequence encoding LIM mineralization protein. The transfection may occur ex vivo or in vivo by direct injection of virus or naked plasmid DNA. In a particular embodiment, the invention provides a method of fusing a spine by transfecting osteogenic precursor cells with an isolated nucleic acid molecule having a nucleotide sequence encoding LIM mineralization protein, admixing the transfected osteogenic precursor cells with a matrix and contacting the matrix with the spine. Finally, the invention relates to methods for inducing systemic bone formation by stable transfection of host cells with the vectors of the invention.

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 60/054,219, filed Jul. 30, 1997, and No. 60/080,407, filed Apr. 2, 1998. The entire disclosures of those provisional applications are incorporated by reference herein.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The field of the invention relates generally to osteogenic cells and the formation of bone and boney tissue in mammalian species. Specifically, the invention concerns a novel family of proteins, and nucleic acids encoding those proteins, that enhances the efficacy of bone mineralization in vitro and in vivo. The invention provides methods for treating a variety of pathological conditions associated bone and boney tissue, such as, for example, spine fusion, fracture repair and osteoporosis.

[0004] 2. Description of the Related Art

[0005] Osteoblasts are thought to differentiate from pluripotent mesenchymal stem cells. The maturation of an osteoblast results in the secretion of an extracellular matrix which can mineralize and form bone. The regulation of this complex process is not well understood but is thought to involve a group of signaling glycoproteins known as bone morphogenetic proteins (BMPs). These proteins have been shown to be involved with embryonic dorsal-ventral patterning, limb bud development, and fracture repair in adult 4., HENDERSON, animals. B. L. Hogan, Genes & Develop., 10:1580 (1996). This group of transforming growth factor-beta superfamily secreted proteins has a spectrum of activities in a variety of cell types at different stages of differentiation; differences in physiological activity between these closely related molecules have not been clarified. D. M. Kingsley, Trends Genet., 10:16 (1994).

[0006] To better discern the unique physiological role of different BMP signaling proteins, we recently compared the potency of BMP-6 with that of BMP-2 and BMP4, for inducing rat calvarial osteoblast differentiation. Boden et al., Endocrinology, 137:3401 (1996). We studied this process in first passage (secondary) cultures of fetal rat calvaria that require BMP or glucocorticoid for initiation of differentiation. In this model of membranous bone formation, glucocorticoid (GC) or a BMP will initiate differentiation to mineralized bone nodules capable of secreting osteocalcin, the osteoblast-specific protein. This secondary culture system is distinct from primary rat osteoblast cultures which undergo spontaneous differentiation. In this secondary system, glucocorticoid resulted in a ten-fold induction of BMP-6 mRNA and protein expression which was responsible for the enhancement of osteoblast differentiation. Boden et al., Endocrinology, 138:2920 (1997).

[0007] In addition to extracellular signals, such as the BMPs, intracellular signals or regulatory molecules may also play a role in the cascade of events leading to formation of new bone. One broad class of intracellular regulatory molecules are the LIM proteins, which are so named because they possess a characteristic structural motif known as the LIM domain. The LIM domain is a cysteine-rich structural motif composed of two special zinc fingers that are joined by a 2-amino acid spacer. Some proteins have only LIM domains, while others contain a variety of additional functional domains. LIM proteins form a diverse group, which includes transcription factors and cytoskeletal proteins. The primary role of LIM domains appears to be in mediating protein-protein interactions, through the formation of dimers with identical or different LIM domains, or by binding distinct proteins.

[0008] In LIM homeodomain proteins, that is, proteins having both LIM domains and a homeodomain sequence, the LIM domains function as negative regulatory elements. LIM homeodomain proteins are involved in the control of cell lineage determination and the regulation of differentiation, although LIM-only proteins may have similar roles. LIM-only proteins are also implicated in the control of cell proliferation since several genes encoding such proteins are associated with oncogenic chromosome translocations.

[0009] Humans and other mammalian species are prone to diseases or injuries that require the processes of bone repair and/or regeneration. For example, treatment of fractures would be improved by new treatment regimens that could stimulate the natural bone repair mechanisms, thereby reducing the time required for the fractured bone to heal. In another example, individuals afflicted with systemic bone disorders, such as osteoporosis, would benefit from treatment regimens that would results in systemic formation of new bone. Such treatment regimens would reduce the incidence of fractures arising from the loss of bone mass that is a characteristic of this disease.

[0010] For at least these reasons, extracellular factors, such as the BMPs, have been investigated for the purpose of using them to stimulate formation of new bone in vivo. Despite the early successes achieved with BMPs and other extracellular signalling molecules, their use entails a number of disadvantages. For example, relatively large doses of purified BMPs are required to enhance the production of new bone, thereby increasing the expense of such treatment methods. Furthermore, extracellular proteins are susceptible to degradation following their introduction into a host animal. In addition, because they are typically immunogenic, the possibility of stimulating an immune response to the administered proteins is ever present.

[0011] Due to such concerns, it would be desirable to have available treatment regimens that use an intracellular signalling molecule to induce new bone formation. Advances in the field of gene therapy now make it possible to introduce into osteogenic precursor cells, that is, cells involved in bone formation, nucleotide fragments encoding intracellular signals that form part of the bone formation process. Gene therapy for bone formation offers a number of potential advantages: (1) lower production costs; (2) greater efficacy, compared to extracellular treatment regiments, due to the ability to achieve prolonged expression of the intracellular signal; (3) it would by-pass the possibility that treatment with extracellular signals might be hampered due to the presence of limiting numbers of receptors for those signals; (4) it permits the delivery of transfected potential osteoprogenitor cells directly to the site where localized bone formation is required; and (5) it would permit systemic bone formation, thereby providing a treatment regimen for osteoporosis and other metabolic bone diseases.

SUMMARY OF THE INVENTION

[0012] The present invention seeks to overcome the drawbacks in the prior art by providing novels compositions and methods for inducing bone formation using an intracellular signalling molecule that participates early in the cascade of events that leads to bone formation. Applicants have discovered 10-4/RLMP (SEQ ID NO: 1, SEQ ID NO: 2), a novel LIM gene with a sequence originally isolated from stimulated rat calvarial osteoblast cultures. The gene has been cloned, sequenced and assayed for its ability to enhance the efficacy of bone mineralization in vitro. The protein RLMP affects mineralization of bone matrix as well as differentiation of cells into the osteoblast lineage. Unlike other known cytokines, for example, BMPs, RLMP is not a secreted protein, but is instead an intracellular signaling molecule. This feature has the advantage of providing intracellular signaling amplification as well as easier assessment of transfected cells. It is also suitable for more efficient and specific in vivo applications. Suitable clinical applications include enhancement of bone repair in fractures, bone defects, bone grafting, and normal homeostasis in patients presenting with osteoporosis.

[0013] Applicants have also cloned, sequenced and deduced the amino acid sequence of a corresponding human protein, named human LMP-1. The human protein demonstrates enhanced efficacy of bone mineralization in vitro and in vivo.

[0014] In addition, the applicants have characterized a truncated (short) version of LMP-1, termed HLMP-1s. This short version resulted from a point mutation in one source of a cDNA clone, providing a stop codon which truncated the protein. The short version (LMP-1s) is fully functional when expressed in cell culture and in vivo.

[0015] Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the methods and compositions of matter particularly pointed out in the written description and claims hereof.

[0016] In one broad aspect, the invention relates to an isolated nucleic acid molecule comprising a nucleic acid sequence encoding any LIM mineralization protein, wherein the nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO: 25, and wherein the molecule hybridizes under highly stringent conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO: 26. In a specific aspect, the isolated nucleic acid molecule encodes HLMP-1, HLMP-1 s or RLMP. In addition, the invention is directed to vectors comprising these nucleic acid molecules, as well as host cells comprising the vectors. In another specific aspect, the invention relates to the proteins themselves.

[0017] In a second broad aspect, the invention relates to antibody that is specific for LIM mineralization protein, including HLMP-1, HLMP-1s and RLMP. In one specific ascpect, the antibody is a polyclonal antibody. In another specific aspect, the antibody is a monoclonal antibody.

[0018] In a third broad aspect, the invention relates to method of inducing bone formation wherein osteogenic precursor cells are transfected with an isolated nucleic acid molecule comprising a nucleotide sequence encoding LIM mineralization protein. In one specific aspect, the isolated nucleic acid molecule is in a vector, which may be a plasmid or a virus, such as adenovirus or retrovirus. The transfection may occur ex vivo or in vivo by direct injection of the isolated nucleic acid molecule. The transfected isolated nucleic acid molecule may encode HLMP-1, HLMP-1s or RLMP.

[0019] In a further aspect, the invention relates to methods of fusing a spine by transfecting osteogenic precursor cells with an isolated nucleic acid molecule having a nucleotide sequence encoding LIM mineralization protein, admixing the transfected osteogenic precursor cells with a matrix and contacting the matrix with the spine.

[0020] In yet another aspect, the invention relates to methods for inducing systemic bone formation by stable transfection of host cells with the vectors of the invention.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. ABBREVIATIONS AND DEFINITIONS BMP Bone Morphogenetic Protein HLMP-1 Human LMP-1, also designated as Human LIM Protein or HLMP HLMP-1s Human LMP-1 Short (truncated) protein HLMPU Human LIM Protein Unique Region LMP LIM mineralization protein MEM Minimal essential medium Trm Triamcinolone β-GlyP Beta-glycerolphosphate RACE Rapid Amplification of cDNA Ends RLMP Rat LIM mineralization protein, also designated as RLMP-1 RLMPU Rat LIM Protein Unique Region RNAsin RNase inhibitor ROB Rat Osteoblast 10-4 Clone containing cDNA sequence for RLMP (SEQ ID NO: 2) UTR Untranslated Region

DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention relates to novel mammalian LIM proteins, herein designated LIM mineralization proteins, or LMP. The invention relates more particularly to human LMP, known as HLMP or HLMP-1. The applicants have discovered that these proteins enhance bone mineralization in mammalian cells grown in vitro. When produced in mammals, LMP also induces bone formation in vivo.

[0023] Ex vivo transfection of bone marrow cells, osteogenic precursor cells or mesenchymal stem cells with nucleic acid that encodes LMP or HLMP, followed by reimplantation of the transfected cells in the donor, is suitable for treating a variety of bone-related disorders or injuries. For example, one can use this method to: augment long bone fracture repair; generate bone in segmental defects; provide a bone graft substitute for fractures; facilitate tumor reconstruction or spine fusion; and provide a local treatment (by injection) for weak or osteoporotic bone, such as in osteoporosis of the hip, vertebrae, or wrist. Transfection with LMP or HLMP-encoding nucleic acid is also useful in: the percutaneous injection of transfected marrow cells to accelerate the repair of fractured long bones; treatment of delayed union or non-unions of long bone fractures or pseudoarthrosis of spine fusions; and for inducing new bone formation in avascular necrosis of the hip or knee.

[0024] In addition to ex vivo-based methods of gene therapy, transfection of a recombinant DNA vector comprising a nucleic acid sequence that encodes LMP or HLMP can be accomplished in viva. When a DNA fragment that encodes LMP or HLMP is inserted into an appropriate viral vector, for example, an adenovirus vector, the viral construct can be injected directly into a body site were endochondral bone formation is desired. By using a direct, percutaneous injection to introduce the LMP or HLMP sequence stimulation of bone formation can be accomplished without the need for surgical intervention either to obtain bone marrow cells (to transfect ex vivo) or to reimplant them into the patient at the site where new bone is required. Alden et al., Neurosurgical Focus (1998), have demonstrated the utility of a direct injection method of gene therapy using a cDNA that encodes BMP-2, which was cloned into an adenovirus vector.

[0025] It is also possible to carry out in vivo gene therapy by directly injecting into an appropriate body site, a naked, that is, unencapsulated, recombinant plasmid comprising a nucleic acid sequence that encodes HLMP. In this embodiment of the invention, transfection occurs when the naked plasmid DNA is taken up, or internalized, by the appropriate target cells, which have been described. As in the case of in viva gene therapy using a viral construct, direct injection of naked plasmid DNA offers the advantage that little or no surgical intervention is required. Direct gene therapy, using naked plasmid DNA that encodes the endothelial cell mitogen VEGF (vascular endothelial growth factor), has been successfully demonstrated in human patients. Baumgartner et al., Circulation, 97(12):1114-23 (1998).

[0026] By using an adenovirus vector to deliver LMP into osteogenic cells, transient expression of LMP is achieved. This occurs because adenovirus does not incorporate into the genome of target cells that are transfected. Transient expression of LMP, that is, expression that occurs during the lifetime of the transfected target cells, is sufficient to achieve the objects of the invention. Stable expression of LMP, however, can occur when a vector that incorporates into the genome of the target cell is used as a delivery vehicle. Retrovirus-based vectors, for example, are suitable for this purpose.

[0027] Stable expression of LMP is particularly useful for treating various systemic bone-related disorders, such as osteoporosis and osteogenesis imperfecta. For this embodiment of the invention, in addition to using a vector that integrates into the genome of the target cell to deliver an LMP-encoding nucleotide sequence into target cells, LMP expression is placed under the control of a regulatable promoter. For example, a promoter that is turned on by exposure to an exogenous inducing agent, such as tetracycline, is suitable. Using this approach, one can stimulate formation of new bone on a systemic basis by administering an effective amount of the exogenous inducing agent. Once a sufficient quantity of bone mass is achieved, administration of the exogenous inducing agent is discontinued. This process may be repeated as needed to replace bone mass lost, for example, as a consequence of osteoporosis.

[0028] Antibodies specific for HLMP are particularly suitable for use in methods for assaying the osteoinductive, that is, bone-forming, potential of patient cells. In this way one can identify patients at risk for slow or poor healing of bone repair. Also, HLMP-specific antibodies are suitable for use in marker assays to identify risk factors in bone degenerative diseases, such as, for example, osteoporosis.

[0029] Following well known and conventional methods, the genes of the present invention are prepared by ligation of nucleic acid segments that encode LMP to other nucleic acid sequences, such as cloning and/or expression vectors. Methods needed to construct and analyze these recombinant vectors, for example, restriction endonuclease digests, cloning protocols, mutagenesis, organic synthesis of oligonucleotides and DNA sequencing, have been described. For DNA sequencing DNA, the dieoxyterminator method is the preferred.

[0030] Many treatises on recombinant DNA methods have been published, including Sambrook et al., Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Press, 2nd edition (1988), Davis et al., Basic Methods in Molecular Biology, Elsevier (1986), and Ausubel et al., Current Protocols in Molecular Biology, Wiley Interscience (1988). These reference manuals are specifically incorporated by reference herein.

[0031] Primer-directed amplification of DNA or cDNA is a common step in the expression of the genes of this invention. It is typically performed by the polymerase chain reaction (PCR). PCR is described in U.S. Pat. No. 4,800,159 to Mullis et al. and other published sources. The basic principle of PCR is the exponential replication of a DNA sequence by successive cycles of primer extension. The extension products of one primer, when hybridized to another primer, becomes a template for the synthesis of another nucleic acid molecule. The primer-template complexes act as substrate for DNA polymerase, which in performing its replication function, extends the primers. The conventional enzyme for PCR applications is the thermostable DNA polymerase isolated from Thermus aquaticus, or Taq DNA polymerase.

[0032] Numerous variations of the basic PCR method exist, and a particular procedure of choice in any given step needed to construct the recombinant vectors of this invention is readily performed by a skilled artisan. For example, to measure cellular expression of 10-4/RLMP, RNA is extracted and reverse transcribed under standard and well known procedures. The resulting cDNA is then analyzed for the appropriate mRNA sequence by PCR.

[0033] The gene encoding the LIM mineralization protein is expressed in an expression vector in a recombinant expression system. Of course, the constructed sequence need not be the same as the original, or its complimentary sequence, but instead may be any sequence determined by the degeneracy of the DNA code that nonetheless expresses an LMP having bone forming activity. Conservative amino acid substitutions, or other modifications, such as the occurrence of an amino-terminal methionine residue, may also be employed.

[0034] A ribosome binding site active in the host expression system of choice is ligated to the 5′ end of the chimeric LMP coding sequence, forming a synthetic gene. The synthetic gene can be inserted into any one of a large variety of vectors for expression by ligating to an appropriately linearized plasmid. A regulatable promoter, for example, the E. coli lac promoter, is also suitable for the expression of the chimeric coding sequences. Other suitable regulatable promoters include trp, tac, recA, T7 and lambda promoters.

[0035] DNA encoding LMP is transfected into recipient cells by one of several standard published procedures, for example, calcium phosphate precipitation, DEAE-Dextran, electroporation or protoplast fusion, to form stable transformants. Calcium phosphate precipitation is preferred, particularly when performed as follows.

[0036] DNAs are coprecipitated with calcium phosphate according to the method of Graham and Van Der, Virology, 52:456 (1973), before transfer into cells. An aliquot of 40-50 μg of DNA, with salmon sperm or calf thymus DNA as a carrier, is used for 0.5×10⁶ cells plated on a 100 mm dish. The DNA is mixed with 0.5 ml of 2×Hepes solution (280 mM NaCl, 50 mM Hepes and 1.5 mM Na₂HPO₄, pH 7.0), to which an equal volume of 2×CaCl₂ (250 mM CaCl₂ and 10 mM Hepes, pH 7.0) is added. A white granular precipitate, appearing after 3040 minutes, is evenly distributed dropwise on the cells, which are allowed to incubate for 4-16 hours at 37° C. The medium is removed and the cells shocked with 15% glycerol in PBS for 3 minutes. After removing the glycerol, the cells are fed with Dulbecco's Minimal Essential Medium (DMEM) containing 10% fetal bovine serum. DNA can also be transfected using: the DEAE-Dextran methods of Kimura et al., Virology, 49:394 (1972) and Sompayrac et al., Proc. Natl. Acad. Sci. USA, 78:7575 (1981); the electroporation method of Potter, Proc. Natl. Acad. Sci. USA, 81:7161 (1984); and the protoplast fusion method of Sandri-Goddin et al., Molec. Cell. Biol., 1:743 (1981).

[0037] Phosphoramidite chemistry in solid phase is the preferred method for the organic synthesis of oligodeoxynucleotides and polydeoxynucleotides. In addition, many other organic synthesis methods are available. Those methods are readily adapted by those skilled in the art to the particular sequences of the invention.

[0038] The present invention also includes nucleic acid molecules that hybridize under standard conditions to any of the nucleic acid sequences encoding the LIM mineralization proteins of the invention. “Standard hybridization conditions” will vary with the size of the probe, the background and the concentration of the nucleic acid reagents, as well as the type of hybridization, for example, in situ, Southern blot, or hybrization of DNA-RNA hybrids (Northern blot). The determination of “standard hybridization conditions” is within the level of skill in the art. For example, see U.S. Pat. No. 5,580,775 to Fremeau et al., herein incorporated by reference for this purpose. See also, Southern, E. M., J. Mol. Biol., 98:503 (1975), Alwine et al., Meth. Enzymol., 68:220 (1979), and Sambrook et al., Molecular Cloning: A laboratory Manual, 2nd edition, pp. 7.19-7.50, Cold Spring Harbor Press (1989).

[0039] One preferred set of standard hybrization conditions involves a blot that is prehybridized at 42° C. for 2 hours in 50% formamide, 5×SSPE (150 nM NaCl, 10 mM Na H₂PO₄ [pH 7.4], 1 mM EDTA [pH 8.0]), 5× Denhardt's solution (20 mg Ficoll, 20 mg polyvinylpyrrolidone and 20 mg BSA per 100 ml water), 10% dextran sulphate, 1% SDS and 100 μg/ml salmon sperm DNA. A ³²P-labelled cDNA probe is added, and hybridization is continued for 14 hours. Afterward, the blot is washed twice with 2×SSPE, 0.1% SDS for 20 minutes at 22° C., followed by a 1 hour wash at 65° C. in 0.1×SSPE, 0.1% SDS. The blot is then dried and exposed to x-ray film for 5 days in the presence of an intensifying screen.

[0040] Under “highly stringent conditions,” a probe will hybridize to its target sequence if those two sequences are substantially identical. As in the case of standard hybridization conditions, one of skill in the art can, given the level of skill in the art and the nature of the particular experiment, determine the conditions under which only susbstantially identical sequences will hybridize.

[0041] Another aspect of the invention includes the proteins encoded by the nucleic acid sequences. In still another embodiment, the inventon relates to the identification of such proteins based on anti-LMP antibodies. In this embodiment, protein samples are prepared for Western blot analysis by lysing cells and separating the proteins by SDS-PAGE. The proteins are transferred to nitrocellulose by electroblotting as described by Ausubel et a., Current Protocols in Molecular Bioloy, John Wiley and Sons (1987).

[0042] After blocking the filter with instant nonfat dry milk (1 gm in 100 ml PBS), anti-LMP antibody is added to the filter and incubated for 1 hour at room temperature. The filter is washed thoroughly with phosphate buffered saline (PBS) and incubated with horseradish peroxidase (HRPO)-antibody conjugate for 1 hour at room temperature. The filter is again washed thoroughly with PBS and the antigen bands are identified by adding diaminobenzidine (DAB).

[0043] Monospecific antibodies are the reagent of choice in the present invention, and are specifically used to analyze patient cells for specific characteristics associated with the expression of LMP. “Monospecific antibody” as used herein is defined as a single antibody species or multiple antibody species with homogenous binding characteristics for LMP. “Homogeneous binding” as used herein refers to the ability of the antibody species to bind to a specific antigen or epitope, such as those associated with LMP, as described above. Monospecific antibodies to LMP are purified from mammalian antisera containing antibodies reactive against LMP or are prepared as monoclonal antibodies reactive with LMP using the technique of Kohler and Milstein, Nature, 256:495-97 (1975). The LMP specific antibodies are raised by immunizing animals such as, for example, mice, rats, guinea pigs, rabbits, goats or horses, with an appropriate concentration of LMP either with or without an immune adjuvant.

[0044] In this process, preimmune serum is collected prior to the first immunization. Each animal receives between about 0.1 mg and about 1000 mg of LMP associated with an acceptable immune adjuvant, if desired. Such acceptable adjuvants include, but are not limited to, Freund's complete, Freund's incomplete, alum-precipitate, water in oil emulsion containing Corynebacterium parvum and tRNA adjuvants. The initial immunization consists of LMP in, preferably, Freund's complete adjuvant injected at multiple sites either subcutaneously (SC), intraperitoneally (IP) or both. Each animal is bled at regular intervals, preferably weekly, to determine antibody titer. The animals may or may not receive booster injections following the initial immunization. Those animals receiving booster injections are generally given an equal amount of the antigen in Freund's incomplete adjuvant by the same route. Booster injections are given at about three week intervals until maximal titers are obtained. At about 7 days after each booster immunization or about weekly after a single immunization, the animals are bled, the serum collected, and aliquots are stored at about −20° C.

[0045] Monoclonal antibodies (mAb) reactive with LMP are prepared by immunizing inbred mice, preferably Balb/c mice, with LMP. The mice are immunized by the IP or SC route with about 0.1 mg to about 10 mg, preferably about 1 mg, of LMP in about 0.5 ml buffer or saline incorporated in an equal volume of an acceptable adjuvant, as discussed above. Freund's complete adjuvant is preferred. The mice receive an initial immunization on day 0 and are rested for about 3-30 weeks. Immunized mice are given one or more booster immunizations of about 0.1 to about 10 mg of LMP in a buffer solution such as phosphate buffered saline by the intravenous (IV) route. Lymphocytes from antibody-positive mice, preferably splenic lymphocytes, are obtained by removing the spleens from immunized mice by standard procedures known in the art. Hybridoma cells are produced by mixing the splenic lymphocytes with an appropriate fusion partner, preferably myeloma cells, under conditions which will allow the formation of stable hybridomas. Fusion partners may include, but are not limited to: mouse myelomas P3/NS1/Ag 4-1; MPC-11; S-194 and Sp 2/0, with Sp 2/0 being preferred. The antibody producing cells and myeloma cells are fused in polyethylene glycol, about 11000 mol. wt., at concentrations from about 30% to about 50%. Fused hybridoma cells are selected by growth in hypoxanthine, thymidine and aminopterin in supplemented Dulbecco's Modified Eagles Medium (DMEM) by procedures known in the art. Supernatant fluids are collected from growth positive wells on about days 14, 18, and 21, and are screened for antibody production by an immunoassay such as solid phase immunoradioassay (SPIRA) using LMP as the antigen. The culture fluids are also tested in the Ouchterlony precipitation assay to determine the isotype of the mAb. Hybridoma cells from antibody positive wells are cloned by a technique such as the soft agar technique of MacPherson, “Soft Agar Techniques”, in Tissue Culture Methods and Applications, Kruse and Paterson (eds.), Academic Press (1973). See, also, Harlow et al., Antibodies: A Laboratory Manual, Cold Spring Laboratory (1988).

[0046] Monoclonal antibodies may also be produced in vivo by injection of pristane-primed Balb/c mice, approximately 0.5 ml per mouse, with about 2×10⁶ to about 6×10⁶ hybridoma cells about 4 days after priming. Ascites fluid is collected at approximately 8-12 days after cell transfer and the monoclonal antibodies are purified by techniques known in the art.

[0047] In vitro production in anti-LMP mAb is carried out by growing the hydridoma cell line in DMEM containing about 2% fetal calf serum to obtain sufficient quantities of the specific mAb. The mAb are purified by techniques known in the art.

[0048] Antibody titers of ascites or hybridoma culture fluids are determined by various serological or immunological assays, which include, but are not limited to, precipitation, passive agglutination, enzyme-linked immunosorbent antibody (ELISA) technique and radioimmunoassay (RIA) techniques. Similar assays are used to detect the presence of the LMP in body fluids or tissue and cell extracts.

[0049] It is readily apparent to those skilled in the art that the above described methods for producing monospecific antibodies may be utilized to produce antibodies specific for polypeptide fragments of LMP, full-length nascent LMP polypeptide, or variants or alleles thereof.

[0050] On Jul. 22, 1997, a sample of 10-4/RLMP in a vector designated pCMV2/RLMP (which is vector pRc/CMV2 with insert 10-4 clone/RLMP) was deposited with the American Type Culture Collection (ATCC), 12301 Parklawn Drive, Rockville, Md. 20852. The culture accession number for that deposit is 209153. On Mar. 19, 1998, a sample of the vector pHis-A with insert HLPM-1 s was deposited at the American Type Culture Collection. The culture accession number for that deposit is 209698. These deposits, made under the requirements of the Budapest Treaty, will be maintained in the ATCC for at least 30 years and will be made available to the public upon the grant of a patent disclosing them. It should be understood that the availability of a deposit does not constitute a license to practice the subject invention in derogation of patent rights granted by government action.

[0051] In assessing the nucleic acids, proteins, or antibodies of the invention, enzyme assays, protein purification, and other conventional biochemical methods are employed. DNA and RNA are analyzed by Southern blotting and Northern blotting techniques, respectively. Typically, the samples analyzed are size fractionated by gel electrophoresis. The DNA or RNA in the gels are then transferred to nitrocellulose or nylon membranes. The blots, which are replicas of sample patterns in the gels, were then hybridized with probes. Typically, the probes are radiolabelled, preferably with ³²P, although one could label the probes with other signal-generating molecules known to those in the art. Specific bands of interest can then be visualized by detection systems, such as autoradiography.

[0052] For purposes of illustrating preferred embodiments of the present invention, the following, non-limiting examples are included. These results demonstrate the feasibiliity of inducing or enhancing the formation of bone using the LIM mineralization proteins of the invention, and the isolated nucleic acid molecules encoding those proteins.

EXAMPLE 1 Calvarial Cell Culture

[0053] Rat calvarial cells, also known as rat osteoblasts (“ROB”), were obtained from 20-day pre-parturition rats as previously described. Boden et al., Endocrinology, 137(8):3401-07 (1996). Primary cultures were grown to confluence (7 days), trypsinized, and passed into 6-well plates (1×10⁵ cells/35 mm well) as first subculture cells. The subculture cells, which were confluent at day 0, were grown for an additional 7 days. Beginning on day 0, media were changed and treatments (Trm and/or BMPs) were applied, under a laminar flow hood, every 3 or 4 days. The standard culture protocol was as follows: days 1-7, MEM, 10% FBS, 50 μg/ml ascorbic acid, stimulus; days 8-14, BGJb medium, 10% FBS, 5 mM β-GlyP (as a source of inorganic phosphate to permit mineralization). Endpoint analysis of bone nodule formation and osteocalcin secretion was performed at day 14. The dose of BMP was chosen as 50 ng/ml based on pilot experiments in this system that demonstrated a mid-range effect on the dose-response curve for all BMPs studied.

EXAMPLE 2 Antisense Treatment and Cell Culture

[0054] To explore the potential functional role of LMP-1 during membranous bone formation, we synthesized an antisense oligonucleotide to block LMP-1 mRNA translation and treated secondary osteoblast cultures that were undergoing differentiation initiated by glucocorticoid. Inhibition of RLMP expression was accomplished with a highly specific antisense oligonucleotide (having no significant homologies to known rat sequences) corresponding to a 25 bp sequence spanning the putative translational start site (SEQ ID NO: 35). Control cultures either did not receive oligonucleotide or they received sense oligonucleotide. Experiments were performed in the presence (preincubation) and absence of lipofectamine. Briefly, 22 μg of sense or antisense RLMP oligonucleotide was incubated in MEM for 45 minutes at room temperature. Following that incubation, either more MEM or pre-incubated lipofectamine/MEM (7% v/v; incubated 45 minutes at room temperature) was added to achieve an oligonucleotide concentration of 0.2 μM. The resulting mixture was incubated for 15 minutes at room temperature. Oligonucleotide mixtures were then mixed with the appropriate medium, that is, MEM/Ascorbate/±Trm, to achieve a final oligonucleotide concentration of 0.1 μM.

[0055] Cells were incubated with the appropriate medium (±stimulus) in the presence or absence of the appropriate oligonucleotides. Cultures originally incubated with =lipofectamine were re-fed after 4 hours of incubation (37° C.; 5% CO₂) with media containing neither lipofectamine nor oligonucleotide. All cultures, especially cultures receiving oligonucleotide, were re-fed every 24 hours to maintain oligonucleotide levels.

[0056] LMP-1 antisense oligonucleotide inhibited mineralized nodule formation and osteocalcin secretion in a dose-dependent manner, similar to the effect of BMP-6 oligonucleotide. The LMP-1 antisense block in osteoblast differentiation could not be rescued by addition of exogenous BMP-6, while the BMP-6 antisense oligonucleotide inhibition was reversed with addition of BMP-6. This experiment further confirmed the upstream position of LMP-1 relative to BMP-6 in the osteoblast differentiation pathway. LMP-1 antisense oligonucleotide also inhibited spontaneous osteoblast differentiation in primary rat osteoblast cultures.

EXAMPLE 3 Quantitation of Mineralized Bone Nodule Formation

[0057] Cultures of ROBs prepared according to Examples 1 and 2 were fixed overnight in 70% ethanol and stained with von Kossa silver stain. A semi-automated computerized video image analysis system was used to quantitate nodule count and nodule area in each well. Boden et al., Endocrinology, 137(8):3401-07 (1996). These values were then divided to calculate the area per nodule values. This automated process was validated against a manual counting technique and demonstrated a correlation coefficient of 0.92

[0058] (p<0.000001). All data are expressed as the mean±standard error of the mean (S.E.M.) calculated from 5 or 6 wells at each condition. Each experiment was confirmed at least twice using cells from different calvarial preparations.

EXAMPLE 4 Quantitation of Osteocalcin Secretion

[0059] Osteocalcin levels in the culture media were measured using a competitive radioimmunoassay with a monospecific polyclonal antibody (Pab) raised in our laboratory against the C-terminal nonapeptide of rat osteocalcin as described in Nanes et al, Endocrinology, 127:588 (1990). Briefly, 1 μg of nonapeptide was iodinated with 1 mCi ¹²⁵I-Na by the lactoperoxidase method. Tubes containing 200 μl of assay buffer (0.02 M sodium phosphate, 1 mM EDTA, 0.001% thimerosal, 0.025% BSA) received media taken from cell cultures or osteocalcin standards (0-12,000 fmole) at 100 μl/tube in assay buffer. The Pab (1:40,000; 100 μl) was then added, followed by the iodinated peptide (12,000 cpm; 100 μl). Samples tested for non-specific binding were prepared similarly but contained no antibody.

[0060] Bound and free PAbs were separated by the addition of 700 μl goat anti-rabbit IgG, followed by incubation for 18 hours at 4° C. After samples were centrifuged at 1200 rpm for 45 minutes, the supernatants were decanted and the precipitates counted in a gamma counter. Osteocalcin values were reported in fmole/100 μl, which was then converted to pmole/ml medium (3-day production) by dividing those values by 100. Values were expressed as the mean ±S.E.M. of triplicate determinations for 5-6 wells for each condition. Each experiment was confirmed at least two times using cells from different calvarial preparations.

EXAMPLE 5 Effect of Trm and RLMP on Mineralization in vitro

[0061] There was little apparent effect of either the sense or antisense oligonucleotides on the overall production of bone nodules in the non-stimulated cell culture system. When ROBs were stimulated with Trm, however, the antisense oligonucleotide to RLMP inhibited mineralization of nodules by >95%. The addition of exogenous BMP-6 to the oligonucleotide-treated cultures did not rescue the mineralization of RLMP-antisense-treated nodules.

[0062] Osteocalcin has long been synonymous with bone mineralization, and osteocalcin levels have been correlated with nodule production and mineralization. The RLMP-antisense oligonucleotide significantly decreases osteocalcin production, but the nodule count in antisense-treated cultures does not change significantly. In this case, the addition of exogenous BMP-6 only rescued the production of osteocalcin in RLMP-antisense-treated cultures by 10-15%. This suggests that the action of RLMP is downstream of, and more specific than, BMP-6.

EXAMPLE 6 Harvest and Purification of RNA

[0063] Cellular RNA from duplicate wells of ROBs (prepared according to Examples 1 and 2 in 6-well culture dishes) was harvested using 4M guanidine isothiocyanate (GIT) solution to yield statistical triplicates. Briefly, culture supernatant was aspirated from the wells, which were then overlayed with 0.6 ml of GIT solution per duplicate well harvest. After adding the GIT solution, the plates were swirled for 5-10 seconds (being as consistent as possible). Samples were saved at −70° C. for up to 7 days before further processing.

[0064] RNA was purified by a slight modification of standard methods according to Sambrook et al., Molecular Cloning: a Laboratory Manual, 2nd Ed., chapter 7.19, Cold Spring Harbor Press (1989). Briefly, thawed samples received 60 μl 2.0 M sodium acetate (pH 4.0), 550 μl phenol (water saturated) and 150 μl chloroform:isoamyl alcohol (49:1). After vortexing, the samples were centrifuged (10000×g; 20 minutes; 4° C.), the aqueous phase transferred to a fresh tube, 600 μl isopropanol was added and the RNA precipitated overnight at −20° C.

[0065] Following the overnight incubation, the samples were centrifuged (10000×g; 20 minutes) and the supernatant was aspirated gently. The pellets were resuspended in 400 μl DEPC-treated water, extracted once with phenol:chloroform (1:1), extracted with chloroform:isoamyl alcohol (24:1) and precipitated overnight at −20° C. after addition of 40 μl sodium acetate (3.0 M; pH 5.2) and 1.0 ml absolute ethanol. To recover the cellular RNA, the samples were centrifuged (10000×g; 20 min), washed once with 70% ethanol, air dried for 5-10 minutes and resuspended in 20 μl of DEPC-treated water. RNA concentrations were calculated from optical densities that were determined with a spectrophotometer.

EXAMPLE 7 Reverse Transcription-Polymerase Chain Reaction

[0066] Heated total RNA (5 μg in 10.5 μl total volume DEPC-H₂O at 65° C. for 5 minutes) was added to tubes containing 4 μl 5×MMLV-RT buffer, 2 μl dNTPs, 2 μl dTl 7 primer (10 pmol/ml), 0.5 μl RNAsin (40U/ml) and 1 μl MMLV-RT (200 units/μl). The samples were incubated at 37° C. for 1 hour, then at 95° C. for 5 minutes to inactivate the MMLV-RT. The samples were diluted by addition of 80, pi of water.

[0067] Reverse-transcribed samples (5 μl) were subjected to polymerase-chain reaction using standard methodologies (50 μl total volume). Briefly, samples were added to tubes containing water and appropriate amounts of PCR buffer, 25 mM MgCl₂, dNTPs, forward and reverse primers for glyceraldehyde 3-phosphate dehydrogenase (GAP, a housekeeping gene) and/or BMP-6), ³P-dCTP, and Taq polymnerase. Unless otherwise noted, primers were standardized to run consistently at 22 cycles (94° C., 30″; 58° C., 30″; 72° C., 20″).

EXAMPLE 8 Quantitation of RT-PCR Products by Polyacrylamide Gel Electrophoresis (PAGE) and Phosphorlmager Analysis

[0068] RT-PCR products received 5 μl/tube loading dye, were mixed, heated at 65° C. for 10 min and centrifuged. Ten pi of each reaction was subjected to PAGE (12% polyacrylamide:bis; 15 V/well; constant current) under standard conditions. Gels were then incubated in gel preserving buffer (10% v/v glycerol, 7% v/v acetic acid, 40% v/v methanol, 43% deionized water) for 30 minutes, dried (80° C.) in vacuo for 1-2 hours and developed with an electronically-enhanced phosphoresence imaging system for 6-24 hours. Visualized bands were analyzed. Counts per band were plotted graphically.

EXAMPLE 9 Differential Display PCR

[0069] RNA was extracted from cells stimulated with glucocorticoid (Trm, 1 nM). Heated, DNasetreated total RNA (5 μg in 10.5 μl total volume in DEPC-H₂O at 65° C. for 5 minutes) was reverse transcribed as described in Example 7, but H-T₁₁M (SEQ ID. NO: 4) was used as the MMLV-RT primer. The resulting cDNAs were PCR-amplified as described above, but with various commercial primer sets (for example, H-T₁₁G (SEQ ID NO: 4) and H-AP-10 (SEQ ID. NO: 5); GenHunter Corp, Nashville, Tenn.).

[0070] Radiolabelled PCR products were fractionated by gel electrophoresis on a DNA sequencing gel. After electrophoresis, the resulting gels were dried in vacuo and autoradiographs were exposed overnight. Bands representing differentially-expressed cDNAs were excised from the gel and reamplified by PCR using the method of Conner et al., Proc. Natl. Acad. Sci. USA, 88:278 (1983). The products of PCR reamplification were cloned into the vector PCR-11 (TA cloning kit; InVitrogen, Carlsbad, Calif.).

EXAMPLE 10 Screening of a UMR 106 Rat Osteosarcoma Cell cDNA Library

[0071] A UMR 106 library (2.5×10¹° pfulml) was plated at 5×10⁴ pfulml onto agar plates (LB bottom agar) and the plates were incubated overnight at 37° C. Filter membranes were overlaid onto plates for two minutes. Once removed, the filters were denatured, rinsed, dried and UV cross-linked. The filters were then incubated in pre-hyridization buffer (2×PIPES [pH 6.5], 5% formamide, 1% SDS and 100 μg/ml denatured salmon sperm DNA) for 2 h at 42° C. A 260 base-pair radiolabelled probe (SEQ ID NO: 3; ³²P labelled by random priming) was added to the entire hybridization mix/filters, followed by hybridization for 18 hours at 42° C. The membranes were washed once at room temperature (10 min, 1×SSC, 0.1% SDS) and three times at 55° C. (15 min, 0.1×SSC, 0.1% SDS).

[0072] After they were washed, the membranes were analyzed by autoradiography as described above. Positive clones were plaque purified. The procedure was repeated with a second filter for four minutes to minimize spurious positives. Plaque-purified clones were rescued as lambda SK(−) phagemids. Cloned cDNAs were sequenced as described below.

EXAMPLE 11 Sequencing of Clones

[0073] Cloned cDNA inserts were sequenced by standard methods. Ausubel et al., Current Protocols in Molecular Biology, Wiley Interscience (1988). Briefly, appropriate concentrations of termination mixture, template and reaction mixture were subjected to an appropriate cycling protocol (95° C.,30 s; 68° C.,30 s; 72° C.,60 s;×25). Stop mixture was added to terminate the sequencing reactions. After heating at 92° C. for 3 minutes, the samples were loaded onto a denaturing 6% polyacrylamide sequencing gel (29:1 acrylamide:bis-acrylamide). Samples were electrophoresed for about 4 hours at 60 volts, constant current. After electrophoresis, the gels were dried in vacuo and autoradiographed.

[0074] The autoradiographs were analyzed manually. The resulting sequences were screened against the databases maintained by the National Center for Biotechnology Information (NIH, Bethesda, Md.; http:/Iwww.ncbi.nlm.nih.gov/) using the BLASTn program set with default parameters. Based on the sequence data, new sequencing primers were prepared and the process was repeated until the entire gene had been sequenced. All sequences were confirmed a minimum of three times in both orientations.

[0075] Nucleotide and amino acid sequences were also analyzed using the PCGENE software package (version 16.0). Per cent homology values for nucleotide sequences were calculated by the program NALIGN, using the following parameters: weight of non-matching nucleotides, 10; weight of non-matching gaps, 10; maximum number of nucleotides considered, 50; and minimum number of nucleotides considered, 50.

[0076] For amino acid sequences, percent homology values were calculated using PALIGN. A value of 10 was selected for both the open gap cost and the unit gap cost.

EXAMPLE 12 Cloning of RLMP cDNA

[0077] The differential display PCR amplification products described in Example 9 contained a major band of approximately 260 base pairs. This sequence was used to screen a rat osteosarcoma (UMR 106) cDNA library. Positive clones were subjected to nested primer analysis to obtain the primer sequences necessary for amplifying the full length cDNA. (SEQ. ID NOs: 11, 12, 29, 30 and 31) One of those positive clones selected for further study was designated clone 10-4.

[0078] Sequence analysis of the full-length cDNA in clone 10-4, determined by nested primer analysis, showed that clone 10-4 contained the original 260 base-pair fragment identified by differential display PCR. Clone 10-4 (1696 base pairs; SEQ ID NO: 2) contains an open reading frame of 1371 base pairs encoding a protein having 457 amino acids (SEQ ID NO: 1). The termination codon, TGA, occurs at nucleotides 1444-1446. The polyadenylation signal at nucleotides 1675-1680, and adjacent poly(A)⁺ tail, was present in the 3′ noncoding region. There were two potential N-glycosylation sites, Asn-Lys-Thr and Asn-Arg-Thr, at amino acid positions 113-116 and 257-259 in SEQ ID NO: 1, respectively. Two potential cAMP- and cGMP-dependent protein kinase phosphorylation sites, Ser and Thr, were found at amino acid positions 191 and 349, respectively. There were five potential protein kinase C phosphorylation sites, Ser or Thr, at amino acid positions 3, 115, 166, 219, 442. One potential ATP/GTP binding site motif A (P-loop), Gly-Gly-Ser-Asn-Asn-Gly-Lys-Thr, was determined at amino acid positions 272-279.

[0079] In addition, two highly conserved putative LIM domains were found at amino acid positions 341-391 and 400-451. The putative LIM domains in this newly identified rat cDNA clone showed considerable homology with the LIM domains of other known LIM proteins. However, the overall homology with other rat LIM proteins was less than 25%. RLMP (also designated 10-4) has 78.5% amino acid homology to the human enigma protein (see U.S. Pat. No. 5,504,192), but only 24.5% and 22.7% amino acid homology to its closest rat homologs, CLP-36 and RIT-18, respectively.

EXAMPLE 13 Northern Blot Analysis of RLMP Expression

[0080] Thirty μg of total RNA from ROBs, prepared according to Examples 1 and 2, was size fractionated by formaldehyde gel electrophoresis in 1% agarose flatbed gels and osmotically transbiotted to nylon membranes. The blot was probed with a 600 base pair EcoRI fragment of full-length 10-4 cDNA labeled with ³²P-dCTP by random priming.

[0081] Northern blot analysis showed a 1.7 kb mRNA species that hybridized with the RLMP probe. RLMP mRNA was up-regulated approximately 3.7-fold in ROBs after 24 hours exposure to BMP-6. No up-regulation of RMLP expression was seen in BMP-2 or BMP4-stimulated ROBs at 24 hours.

EXAMPLE 14 Statistical Methods

[0082] For each reported nodule/osteocalcin result, data from 5-6 wells from a representative experiment were used to calculate the mean±S.E.M. Graphs may be shown with data normalized to the maximum value for each parameter to allow simultaneous graphing of nodule counts, mineralized areas and osteocalcin.

[0083] For each reported RT-PCR, RNase protection assay or Western blot analysis, data from triplicate samples of representative experiments, were used to determine the mean±S.E.M. Graphs may be shown normalized to either day 0 or negative controls and expressed as fold-increase above control values.

[0084] Statistical significance was evaluated using a one-way analysis of variance with post-hoc multiple comparison corrections of Bonferroni as appropriate. D. V. Huntsberger, “The Analysis of Variance,” in Elements of Statistical Variance, P. Billingsley (ed.), pp. 298-330, Allyn & Bacon Inc., Boston, Mass. (1977) and Sigmastat, Jandel Scientific, Corte Madera, Calif. Alpha levels for significance were defined as p<0.05.

EXAMPLE 15 Detection of Rat LIM Mineralization Protein by Western Blot Analysis

[0085] Polyclonal antibodies were prepared according to the methods of England et al., Biochim. Biophys. Acta, 623:171 (1980) and Timmer et al., J. Biol. Chem., 268:24863 (1993).

[0086] HeLa cells were transfected with pCMV2/RLMP. Protein was harvested from the transfected cells according to the method of Hair et al., Leukemia Research, 20:1 (1996). Western Blot Analysis of native RLMP was performed as described by Towbin et al., Proc. Natl. Acad. Sci. USA, 76:4350 (1979).

EXAMPLE 16 Synthesis of the Rat LMP-Unique (RLMPU) derived Human PCR Product

[0087] Based on the sequence of the rat LMP-1 cDNA, forward and reverse PCR primers (SEQ ID NOs: 15 and 16) were synthesized and a unique 223 base-pair sequence was PCR amplified from the rat LMP-1 cDNA. A similar PCR product was isolated from human MG63 osteosarcoma cell cDNA with the same PCR primers.

[0088] RNA was harvested from MG63 osteosarcoma cells grown in T-75 flasks. Culture supernatant was removed by aspiration and the flasks were overlayed with 3.0 ml of GIT solution per duplicate, swirled for 5-10 seconds, and the resulting solution was transferred to 1.5 ml eppendorf tubes (5 tubes with 0.6 mil/tube). RNA was purified by a slight modification of standard methods, for example, see Sambrook et al., Molecular Cloning: A Laboratory Manual, chapter 7, page 19, Cold Spring Harbor Laboratory Press (1989) and Boden et al., Endocrinology, 138:2820-28 (1997). Briefly, the 0.6 ml samples received 60 μl 2.0 M sodium acetate (pH 4.0), 550 μl water saturated phenol and 150 μl chloroform:isoamyl alcohol (49:1). After addiiton of those reagents, the samples were vortexed, centrifuged (10000×. g; 20 min; 4C) and the aqueous phase transferred to a fresh tube. Isopropanol (600 μl) was added and the RNA was precipitated overnight at −20° C. The samples were centrifuged (10000×g; 20 minutes) and the supernatant was aspirated gently. The pellets were resuspended in 400 μl of DEPC-treated water, extracted once with phenol:chloroform (1:1), extracted with chloroform;isoamyl alcohol (24:1) and precipitated overnight at −20° C. in 40 μl sodium acetate (3.0 M; pH 5.2) and 1.0 ml absolute ethanol. After precipitation, the samples were centrifuged (10000×g; 20 min), washed once with 70% ethanol, air dried for 5-10 minutes and resuspended in 20 μl of DEPC-treated water. RNA concentrations were derived from optical densities.

[0089] Total RNA (5 μg in 10.5 μL total volume in DEPC-H₂O) was heated at 65° C. for 5 minutes, and then added to tubes containing 4 μl 5×MMLV-RT buffer, 2 μl dNTPs, 2 μl dTl7 primer (10 pmol/ml), 0.5 μl RNAsin (40 U/ml) and 1 μl MMLV-RT (200 units/pl). The reactions were incubated at 37° C. for 1 hour. Afterward, the MMLV-RT was inactivated by heating at 95° C. for 5 minutes. The samples were diluted by addition of 80 μL water.

[0090] Transcribed samples (5 μl) were subjected to polymerase-chain reaction using standard methodologies (50 μl total volume). Boden et al., Endocrinology, 138:2820-28 (1997); Ausubel et al., “Quantitation of rare DNAs by the polymerase chain reaction”, in Current Protocols in Molecular Biology, chapter 15.31-1, Wiley & Sons, Trenton, N.J. (1990). Briefly, samples were added to tubes containing water and appropriate amounts of PCR buffer (25 mM MgCl₂, dNTPs, forward and reverse primers (for RLMPU; SEQ ID NOs: 15 and 16), ³²P-dCTP, and DNA polymerase. Primers were designed to run consistently at 22 cycles for radioactive band detection and 33 cycles for amplification of PCR product for use as a screening probe (94° C., 30 sec, 58° C., 30 sec; 72° C., 20 sec).

[0091] Sequencing of the agarose gel-purified MG63 osteosarcoma-derived PCR product gave a sequence more than 95% homologous to the RLMPU PCR product. That sequence is designated HLMP unique region (HLMPU; SEQ ID NO: 6).

EXAMPLE 17 Screening of Reverse-Transcriptase-Derived MG63 cDNA

[0092] Screening was performed with PCR using specific primers (SEQ ID NOs: 16 and 17) as described in Example 7. A 717 base-pair MG63 PCR product was agarose gel purified and sequenced with the given primers (SEQ. ID NOs: 12, 15, 16, 17, 18, 27 and 28). Sequences were confirmed a minimum of two times in both directions. The MG63 sequences were aligned against each other and then against the full-length rat LMP cDNA sequence to obtain a partial human LMP cDNA sequence (SEQ ID NO: 7).

EXAMPLE 18 Screening of a Human Heart cDNA Library

[0093] Based on Northern blot experiments, it was determined that LMP-1 is expressed at different levels by several different tissues, including human heart muscle. A human heart cDNA library was therefore examined. The library was plated at 5×10⁴ pfu/ml onto agar plates (LB bottom agar) and plates were grown overnight at 37° C. Filter membranes were overlaid onto the plates for two minutes. Afterward, the filters denatured, rinsed, dried, UV cross-linked and incubated in pre-hyridization buffer (2×PIPES [pH 6.5]; 5% formamide, 1% SDS, 100 g/ml denatured salmon sperm DNA) for 2 h at 42° C. A radiolabelled, LMP-unique, 223 base-pair probe (³²P, random primer labelling; SEQ ID NO: 6) was added and hybridized for 18 h at 42° C. Following hybridization, the membranes were washed once at room temperature (10 min, 1×SSC, 0.1% SDS) and three times at 55° C. (15 min, 0.1×SSC, 0.1% SDS). Double-positive plaque-purified heart library clones, identified by autoradiography, were rescued as lambda phagemids according to the manufacturers' protocols (Stratagene, La Jolla, Calif.).

[0094] Restriction digests of positive clones yielded cDNA inserts of varying sizes. Inserts greater than 600 base-pairs in length were selected for initial screening by sequencing. Those inserts were sequenced by standard methods as described in Example 11.

[0095] One clone, number 7, was also subjected to automated sequence analysis using primers corresponding to SEQ ID NOs: 11-14, 16 and 27. The sequences obtained by these methods were routinely 97-100% homologous. Clone 7 (Partial Human LMP-1 cDNA from a heart library; SEQ. ID NO: 8) contained sequence that was more than 87% homologous to the rat LMP cDNA sequence in the translated region.

EXAMPLE 19 Determination of Full-Length Human LMP-1 cDNA

[0096] Overlapping regions of the MG63 human osteosarcoma cell cDNA sequence and the human heart cDNA clone 7 sequence were used to align those two sequences and derive a complete human cDNA sequence of 1644 base-pairs. NALIGN, a program in the PCGENE software package, was used to align the two sequences. The overlapping regions of the two sequences constituted approximately 360 base-pairs having complete homology except for a single nucleotide substitution at nucleotide 672 in the MG63 cDNA (SEQ ID NO: 7) with clone 7 having an “A” instead of a “G” at the corresponding nucleotide 516 (SEQ ID NO: 8).

[0097] The two aligned sequences were joined using SEQIN, another subprogram of PCGENE, using the “G” substitution of the MG63 osteosarcoma cDNA clone. The resulting sequence is shown in SEQ ID NO: 9. Alignment of the novel human-derived sequence with the rat LMP-1 cDNA was accomplished with NALIGN. The full-length human LMP-1 cDNA sequence (SEQ. ID NO: 9) is 87.3% homologous to the translated portion of rat LMP-1 cDNA sequence.

EXAMPLE 20 Determination of Amino Acid Sequence of Human LMP-1

[0098] The putative amino acid sequence of human LMP-1 was determined with the PCGENE subprogram TRANSL. The open reading frame in SEQ ID NO: 9 encodes a protein comprising 457 amino acids (SEQ. ID NO: 10). Using the PCGENE subprogram Palign, the human LMP-1 amino acid sequence was found to be 94.1% homologous to the rat LMP-1 amino acid sequence.

EXAMPLE 21 Determination of the 5 Prime Untranslated Region of the Human LMP cDNA

[0099] MG635′ cDNA was amplified by nested RT-PCR of MG63 total RNA using a 5′ rapid amplification of cDNA ends (5′ RACE) protocol. This method included first strand cDNA synthesis using a lock-docking oligo (dT) primer with two degenerate nucleotide positions at the 3′ end (Chenchik et al., CLONTECHniques. X:5 (1995); Borson et al., PC Methods Applic., 2:144 (1993)). Second-strand synthesis is performed according to the method of Gubler et al., Gene, 25:263 (1983), with a cocktail of Escherichia coli DNA polymerase 1, RNase H, and E. coli DNA ligase. After creation of blunt ends with T4 DNA polymerase, double-stranded cDNA was ligated to the fragment (5′-CTAATACGACTCACTATAGGGCTCGAGCGGCCGCCCGGGCAGGT-3′) (SEQ.ID NO: 19). Prior to RACE, the adaptor-ligated cDNA was diluted to a concentration suitable for Marathon RACE reactions (1:50). Adaptor-ligated double-stranded cDNA was then ready to be specifically cloned.

[0100] First-round PCR was performed with the adaptor-specific oligonucleotide, 5′-CCATCCTAATACGACTCACTATAGGGC-3′ (API) (SEQ.ID NO: 20) as sense primer and a Gene Specific Primer (GSP) from the unique region described in Example 16 (HLMPU). The second round of PCR was performed using a nested primers GSP1-HLMPU (antisense/reverse primer) (SEQ. ID NO: 23) and GSP2-HLMPUF (SEQ. ID NO: 24) (see Example 16; sense/forward primer). PCR was performed using a commercial kit (Advantage cDNA PCR core kit; CloneTech Laboratories Inc., Palo Alto, Calif.) that utilizes an antibody-mediated, but otherwise standard, hot-start protocol. PCR conditions for MG63 cDNA included an initial hot-start denaturation (94° C., 60 sec) followed by: 94° C., 30 sec; 60° C., 30 sec; 68° C., 4 min; 30 cycles. The first-round PCR product was approximately 750 base-pairs in length whereas the nested PCR product was approximately 230 base-pairs. The first-round PCR product was cloned into linearized pCR 2.1 vector (3.9 Kb). The inserts were sequenced in both directions using M13 Forward and Reverse primers (SEQ. ID NO: 11; SEQ. ID NO: 12)

EXAMPLE 22 Determination of Full-length Human LMP-1 cDNA with 5 Prime UTR

[0101] Overlapping MG63 human osteosarcoma cell cDNA 5′-UTR sequence (SEQ ID NO: 21), MG63717 base-pair sequence (Example 17; SEQ ID NQ: 8) and human heart cDNA clone 7 sequence (Example 18) were aligned to derive a novel human cDNA sequence of 1704 base-pairs (SEQ.ID NO: 22). The alignment was accomplished with NALIGN, (both PCGENE and Omiga 1.0; Intelligenetics). Over-lapping sequences constituted nearly the entire 717 base-pair region (Example 17) with 100% homology.

[0102] Joining of the aligned sequences was accomplished with SEQIN.

EXAMPLE 23 Construction of LIM Protein Expression Vector

[0103] The construction of pHIS-5ATG LMP-1 s expression vector was carried out with the sequences described in Examples 17 and 18. The 717 base-pair clone (Example 17; SEQ ID NO: 7) was digested with Cial and EcoRV. A small fragment (˜250 base-pairs) was gel purified. Clone 7 (Example 18; SEQ ID NO: 8) was digested with ClaI and XbaI and a 1400 base-pair fragment was gel purified. The isolated 250 base-pair and 1400 base-pair restriction fragments were ligated to form a fragment of −1650 base-pairs.

[0104] Due to the single nucleotide substitution in Clone 7 (relative to the 717 base-pair PCR sequence and the original rat sequence) a stop codon at translated base-pair 672 resulted. Because of this stop codon, a truncated (short) protein was encoded, hence the name LMP-1s. This was the construct used in the expression vector (SEQ ID NO: 32). The full length cDNA sequence with 5′ UTR (SEQ ID NO: 33) was created by alignment of SEQ ID NO: 32 with the 5′ RACE sequence (SEQ ID NO: 21). The amino acid sequence of LMP-1 s (SEQ ID NO: 34) was then deduced as a 223 amino acid protein and confirmed by Western blot (as in Example 15) to run at the predicted molecular weight of −23.7 kD.

[0105] The pHis-ATG vector (InVitrogen, Carlsbad, Calif.) was digested with EcoRV and XbaI. The vector was recovered and thel650 base-pair restriction fragment was then ligated into the linearized pHis-ATG. The ligated product was cloned and amplified. The pHis-ATG-LMP-1 s Expression vector, also designated pHIS-A with insert HLMP-1s, was purified by standard methods.

EXAMPLE 24 Induction of Bone Nodule Formation and Mineralization in vitro with LMP Expression Vector

[0106] Rat Calvarial cells were isolated and grown in secondary culture according to Example 1. Cultures were either unstimulated or stimulated with glucocorticoid (GC) as described in Example 1. A modification of the Superfect Reagent (Qiagen, Valencia, Calif.) transfection protocol was used to transfect 3 μg/well of each vector into secondary rat calvarial osteoblast cultures according to Example 25.

[0107] Mineralized nodules were visualized by Von Kossa staining, as described in Example 3.

[0108] Human LMP-1 s gene product overexpression alone induced bone nodule formation (˜203 nodules/well) in vitro. Levels of nodules were approximately 50% of those induced by the GC positive control (˜412 nodules/well). Other positive controls included the pHisA-LMP-Rat expression vector (˜1152 nodules/well) and the pCMV2/LMP-Rat-Fwd Expression vector (˜206 nodules/well), whereas the negative controls included the pCMV2/LMP-Rat-Rev. Expression vector (˜2 nodules/well) and untreated (NT) plates (˜4 nodules/well). These data demonstrate that the human cDNA was at least as osteoinductive as the rat cDNA. The effect was less than that observed with GC stimulation, most likely due to suboptimal doses of Expression vector.

EXAMPLE 25 LMP-lnduced Cell Differentiation in vitro and in vivo

[0109] The rat LMP cDNA in clone 10-4 (see Example 12) was excised from the vector by double-digesting the clone with NotI and ApaI overnight at 37° C. Vector pCMV2 MCS (InVitrogen, Carlsbad, Calif.) was digested with the same restriction enzymes. Both the linear cDNA fragment from clone 10-4 and pCMV2 were gel purified, extracted and ligated with T4 ligase. The ligated DNA was gel purified, extracted and used to transform E. coli JM109 cells for amplification. Positive agar colonies were picked, digested with NotI and ApaI and the restriction digests were examined by gel electrophoresis. Stock cultures were prepared of positive clones.

[0110] A reverse vector was prepared in analogous fashion except that the restriction enzymes used were XbaI and HindIII. Because these restriction enzymes were used, the LMP cDNA fragment from clone 10-4 was inserted into pRc/CMV2 in the reverse (that is, non-translatable) orientation. The recombinant vector produced is designated pCMV2/RLMP.

[0111] An appropriate volume of pCMV10-4 (60 nM final concentration is optimal [3 μg]; for this experiment a range of 0-600 nM/well [0-30 μg/well] final concentration is preferred) was resuspended in Minimal Eagle Media (MEM) to 450 μl final volume and vortexed for 10 seconds. Superfect was added (7.5 μl/ml final solution), the solution was vortexed for 10 seconds and then incubated at room termperature for 10 minutes. Following this incubation, MEM supplemented with 10% FBS (1 ml/well; 6 ml/plate) was added and mixed by pipetting.

[0112] The resulting solution was then promptly pipetted (1 ml/well) onto washed ROB cultures. The cultures were incubated for 2 hours at 37° C. in a humidified atmosphere containing 5% CO₂. Afterward, the cells were gently washed once with sterile PBS and the appropriate normal incubation medium was added.

[0113] Results demonstrated significant bone nodule formation in all rat cell cultures which were induced with pCMV10-4. For example, pCMV10-4 transfected cells produced 429 nodules/well. Positive control cultures, which were exposed to Trm, produced 460 nodules/well. In contrast, negative controls, which received no treatment, produced 1 nodule/well. Similarly, when cultures were transfected with pCMV10-4 (reverse), no nodules were observed.

[0114] For demonstrating de novo bone formation in vivo, marrow was aspirated from the hindlimbs of 4-5 week old normal rats (rnu/+; heterozygous for recessive athymic condition). The aspirated marrow cells were washed in alpha MEM, centrifuged, and RBCs were lysed by resuspending the pellet in 0.83% NH₄Cl in 10 mM Tris (pH 7.4). The remaining marrow cells were washed 3×with MEM and transfected for 2 hours with 9 μg of pCMV-LMP-1 s (forward or reverse orientation) per 3×10⁶ cells. The transfected cells were then washed 2×with MEM and resuspended at a concentration of 3×10⁷ cells/ml.

[0115] The cell suspension (100 μl) was applied via sterile pipette to a sterile 2×5 mm type I bovine collagen disc (Sulzer Orthopaedics, Wheat Ridge, Colo.). The discs were surgically implanted subcutaneously on the skull, chest, abdomen or dorsal spine of 4-5 week old athymic rats (mu/rnu). The animals were scarified at 34 weeks, at which time the discs or surgical areas were excised and fixed in 70% ethanol. The fixed specimens were analyzed by radiography and undecalcified histologic examination was performed on 5 μm thick sections stained with Goldner Trichrome. Experiments were also performed using devitalized (guanidine extracted) demineralized bone matrix (Osteotech, Shrewsbury, N.J.) in place of collagen discs.

[0116] Radiography revealed a high level of mineralized bone formation that conformed to the form of the original collagen disc containing LMP-1 s transfected marrow cells. No mineralized bone formation was observed in the negative control (cells transfected with a reverse-oriented version of the LMP-1 s cDNA that did not code for a translated protein), and absorption of the carrier appeared to be well underway.

[0117] Histology revealed new bone trabeculae lined with osteroblasts in the LMP-ls transfected implants. No bone was seen along with partial resorption of the carrier in the negative controls. Radiography of a further experiment in which 18 sets (9 negative control pCMV-LMP-REV & 9 experimental pCMV-LMP-1 s) of implants were added to sites alternating between lumbar and thoracic spine in athymic rats demonstrated 0/9 negative control implants exhibiting bone formation (spine fusion) between vertebrae. All nine of the pCMV-LMP-1 s treated implants exhibited solid bone fusions between vertebrae.

EXAMPLE 26 The Synthesis of pHIS-5′ ATG LMP-ls Expression Vector from the sequences Demonstrated in Examples 2 and 3.

[0118] The 717 base-pair clone (Example 17) was digested with Cial and EcoRV (New England Biologicals, city, MA). A small fragment (˜250 base-pairs) was gel purified. Clone No. 7 (Example 18) was digested with Cial and XbaI. A 1400 base-pair fragment was gel purified from that digest. The isolated 250 base-pair and 1400 base-pair cDNA fragments were ligated by standard methods to form a fragment of ˜1650 bp. The pHis-A vector (InVitrogen) was digested with EcoRV and XbaI. The linearized vector was recovered and ligated to the chimeric 1650 base-pair cDNA fragment. The ligated product was cloned and amplified by standard methods, and the pHis-A-5′ ATG LMP-1 s expression vector, also denominated as the vector pHis-A with insert HLMP-1 s, was deposited at the ATCC as previously described.

EXAMPLE 27 The Induction of Bone Nodule Formation and Mineralization in vitro With pHis-5′ ATG LMP-ls Expression Vector

[0119] Rat calvarial cells were isolated and grown in secondary culture according to Example 1. Cultures were either unstimulated or stimulated with glucocorticoid (GC) according to Example 1. The cultures were transfected with 3 μg of recombinant pHis-A vector DNA/well as described in Example 25. Mineralized nodules were visualized by Von Kossa staining according to Example 3.

[0120] Human LMP-ls gene product overexpression alone (i.e., without GC stimulation) induced significant bone nodule formation (˜203 nodules/well) in vitro. This is approximately 50% of the amount of nodules produced by cells exposed to the GC positive control (˜412 nodules/well). Similar results were obtained with cultures transfected with pHisA-LMP-Rat Expression vector (˜152 nodules/well) and pCMV2/LMP-Rat-Fwd (˜206 nodules/well). In contrast, the negative control pCMV2/LMP-Rat-Rev yielded (˜2 nodules/well), while approximately 4 nodules/well were seen in the untreated plates. These data demonstrate that the human LMP-1 cDNA was at least as osteoinductive as the rat LMP-1 cDNA in this model system. The effect in this experiment was less than that observed with GC stimulation; but in some the effect was comparable.

EXAMPLE 28 LMP Induces Secretion of a Soluble Osteoinductive Factor

[0121] Overexpression of RLMP-1 or HLMP-1 s in rat calvarial osteoblast cultures as described in Example 24 resulted in significantly greater nodule formation than was observed in the negative control. To study the mechanism of action of LIM mineralization protein conditioned medium was harvested at different time points, concentrated to 10×, sterile filtered, diluted to its original concentration in medium containing fresh serum, and applied for four days to untransfected cells.

[0122] Conditioned media harvested from cells transfected with RLMP-1 or HLMP-1s at day 4 was approximately as effective in inducing nodule formation as direct overexpression of RLMP-1 in transfected cells. Conditioned media from cells transfected with RLMP-1 or HLMP-1 in the reverse orientation had no apparent effect on nodule formation. Nor did conditioned media harvested from LMP-1 transfected cultures before day 4 induce nodule formation. These data suggest that expression of LMP-1 caused the synthesis and/or secretion of a soluble factor, which did not appear in culture medium in effectie amounts until 4 days post transfection.

[0123] Since overexpression of rLMP-1 resulted in the secretion of an osteoinductive factor into the medium, Western blot analysis was used to determine if LMP-1 protein was present in the medium. The presence of rLMP-1 protein was assessed using antibody specific for LMP-1 (QDPDEE) and detected by conventional means. LMP-1 protein was found only in the cell layer of the culture and not detected in the medium.

[0124] Partial purification of the osteoinductive soluble factor was accomplished by standard 25% and 100% ammonium sulfate cuts followed by DE-52 anion exchange batch chromatography (100 mM or 500 mM NaCl). All activity was observed in the high ammonium sulfate, high NaCl fractions. Such localization is consistent with the possibility of a single factor being responsible for conditioning the medium.

[0125] All cited publications are hereby incorporated by reference in their entirety.

[0126] While the foregoing specification teaches the principles of the present invention, with examples provided for the purpose of illustration, it will be appreciated by one skilled in the art from reading this disclosure that various changes in form and detail can be made without departing from the true scope of the invention.

1 36 1 457 PRT Rattus norvegicus 1 Met Asp Ser Phe Lys Val Val Leu Glu Gly Pro Ala Pro Trp Gly Phe 1 5 10 15 Arg Leu Gln Gly Gly Lys Asp Phe Asn Val Pro Leu Ser Ile Ser Arg 20 25 30 Leu Thr Pro Gly Gly Lys Ala Ala Gln Ala Gly Val Ala Val Gly Asp 35 40 45 Trp Val Leu Ser Ile Asp Gly Glu Asn Ala Gly Ser Leu Thr His Ile 50 55 60 Glu Ala Gln Asn Lys Ile Arg Ala Cys Gly Glu Arg Leu Ser Leu Gly 65 70 75 80 Leu Ser Arg Ala Gln Pro Ala Gln Ser Lys Pro Gln Lys Ala Leu Thr 85 90 95 Pro Pro Ala Asp Pro Pro Arg Tyr Thr Phe Ala Pro Ser Ala Ser Leu 100 105 110 Asn Lys Thr Ala Arg Pro Phe Gly Ala Pro Pro Pro Thr Asp Ser Ala 115 120 125 Leu Ser Gln Asn Gly Gln Leu Leu Arg Gln Leu Val Pro Asp Ala Ser 130 135 140 Lys Gln Arg Leu Met Glu Asn Thr Glu Asp Trp Arg Pro Arg Pro Gly 145 150 155 160 Thr Gly Gln Ser Arg Ser Phe Arg Ile Leu Ala His Leu Thr Gly Thr 165 170 175 Glu Phe Met Gln Asp Pro Asp Glu Glu Phe Met Lys Lys Ser Ser Gln 180 185 190 Val Pro Arg Thr Glu Ala Pro Ala Pro Ala Ser Thr Ile Pro Gln Glu 195 200 205 Ser Trp Pro Gly Pro Thr Thr Pro Ser Pro Thr Ser Arg Pro Pro Trp 210 215 220 Ala Val Asp Pro Ala Phe Ala Glu Arg Tyr Ala Pro Asp Lys Thr Ser 225 230 235 240 Thr Val Leu Thr Arg His Ser Gln Pro Ala Thr Pro Thr Pro Leu Gln 245 250 255 Asn Arg Thr Ser Ile Val Gln Ala Ala Ala Gly Gly Gly Thr Gly Gly 260 265 270 Gly Ser Asn Asn Gly Lys Thr Pro Val Cys His Gln Cys His Lys Ile 275 280 285 Ile Arg Gly Arg Tyr Leu Val Ala Leu Gly His Ala Tyr His Pro Glu 290 295 300 Glu Phe Val Cys Ser Gln Cys Gly Lys Val Leu Glu Glu Gly Gly Phe 305 310 315 320 Phe Glu Glu Lys Gly Ala Ile Phe Cys Pro Ser Cys Tyr Asp Val Arg 325 330 335 Tyr Ala Pro Ser Cys Ala Lys Cys Lys Lys Lys Ile Thr Gly Glu Ile 340 345 350 Met His Ala Leu Lys Met Thr Trp His Val Pro Cys Phe Thr Cys Ala 355 360 365 Ala Cys Lys Thr Pro Ile Arg Asn Arg Ala Phe Tyr Met Glu Glu Gly 370 375 380 Ala Pro Tyr Cys Glu Arg Asp Tyr Glu Lys Met Phe Gly Thr Lys Cys 385 390 395 400 Arg Gly Cys Asp Phe Lys Ile Asp Ala Gly Asp Arg Phe Leu Glu Ala 405 410 415 Leu Gly Phe Ser Trp His Asp Thr Cys Phe Val Cys Ala Ile Cys Gln 420 425 430 Ile Asn Leu Glu Gly Lys Thr Phe Tyr Ser Lys Lys Asp Lys Pro Leu 435 440 445 Cys Lys Ser His Ala Phe Ser His Val 450 455 2 1696 DNA Rattus norvegicus 2 gcacgaggat cccagcgcgg ctcctggagg ccgccaggca gccgcccagc cgggcattca 60 ggagcaggta ccatggattc cttcaaggta gtgctggagg gacctgcccc ttggggcttc 120 cgtctgcaag ggggcaagga cttcaacgtg cccctctcca tctctcggct cactcctgga 180 ggcaaggccg cacaggccgg tgtggccgtg ggagactggg tactgagtat cgacggtgag 240 aacgccggaa gcctcacaca cattgaagcc cagaacaaga tccgtgcctg tggggagcgc 300 ctcagcctgg gtcttagcag agcccagcct gctcagagca aaccacagaa ggccctgacc 360 cctcccgccg accccccgag gtacactttt gcaccaagcg cctccctcaa caagacggcc 420 cggcccttcg gggcaccccc acctactgac agcgccctgt cgcagaatgg acagctgctc 480 agacagctgg tccctgatgc cagcaagcag cggctgatgg agaatactga agactggcgc 540 ccgcggccag ggacaggcca gtcccgttcc ttccgcatcc ttgctcacct cacgggcaca 600 gagttcatgc aagacccgga tgaggaattc atgaagaagt caagccaggt gcccaggaca 660 gaagccccag ccccagcctc aaccataccc caggaatcct ggcctggccc caccaccccc 720 agccccacca gccgcccacc ctgggccgta gatcctgcat ttgctgagcg ctatgcccca 780 gacaaaacca gcacagtgct gacccgacac agccagccag ccacacctac gcctctgcag 840 aaccgcacct ccatagttca ggctgcagct ggagggggca caggaggagg cagcaacaat 900 ggcaagacgc ctgtatgcca ccagtgccac aagatcatcc gcggccgata cctggtagca 960 ctgggccacg cgtaccatcc tgaggaattt gtgtgcagcc agtgtgggaa ggtcctggaa 1020 gagggtggct tcttcgagga gaagggagct atcttttgcc cctcctgcta tgatgtgcgc 1080 tatgcaccca gctgtgccaa atgcaagaag aagatcactg gagagatcat gcatgcgctg 1140 aagatgacct ggcatgttcc ctgcttcacc tgtgcagcct gcaaaacccc tatccgcaac 1200 agggctttct acatggagga gggggctccc tactgcgagc gagattacga gaagatgttt 1260 ggcacaaagt gtcgcggctg tgacttcaag atcgatgccg gggaccgttt cctggaagcc 1320 ctgggtttca gctggcatga tacgtgtttt gtttgcgcaa tatgtcaaat caacttggaa 1380 ggaaagacct tctactccaa gaaggacaag cccctgtgca agagccatgc cttttcccac 1440 gtatgagcac ctcctcacac tactgccacc ctactctgcc agaagggtga taaaatgaga 1500 gagctctctc tccctcgacc tttctgggtg gggctggcag ccattgtcct agccttggct 1560 cctggccaga tcctggggct ccctcctcac agtccccttt cccacacttc ctccaccacc 1620 accaccgtca ctcacaggtg ctagcctcct agccccagtt cactctggtg tcacaataaa 1680 cctgtatgta gctgtg 1696 3 260 DNA Rattus norvegicus 3 ttctacatgg aggagggggc tccctactgc gagcgagatt acgagaagat gtttggcaca 60 aagtgtcgcg gctgtgactt caagatcgat gccggggacc gtttcctgga agccctgggt 120 ttcagctggc atgatacgtg ttttgtttgc gcaatatgtc aaatcaactt ggaaggaaag 180 accttctact ccaagaagga caagcccctg tgcaagagcc atgccttttc ccacgtatga 240 gcacctcctc acactactgc 260 4 16 DNA Artificial Sequence Differential Display PCR Primer 4 aagctttttt tttttg 16 5 13 DNA Artificial Sequence Differential Display PCR Primer 5 aagcttggct atg 13 6 223 DNA Rattus norvegicus 6 atccttgctc acctcacggg caccgagttc atgcaagacc cggatgagga gcacctgaag 60 aaatcaagcc aggtgcccag gacagaagcc ccagccccag cctcatctac accccaggag 120 ccctggcctg gccctaccgc ccccagccct accagccgcc cgccctgggc tgtggaccct 180 gcgtttgccg agcgctatgc cccagacaaa accagcacag tgc 223 7 717 DNA Homo sapiens 7 atggattcct tcaaggtagt gctggagggg ccagcacctt ggggcttccg gctgcaaggg 60 ggcaaggact tcaatgtgcc cctctccatt tcccggctca ctcctggggg caaagcggcg 120 caggccggag tggccgtggg tgactgggtg ctgagcatcg atggcgagaa tgcgggtagc 180 ctcacacaca tcgaagctca gaacaagatc cgggcctgcg gggagcgcct cagcctgggc 240 ctcagcaggg cccagccggt tcagagcaaa ccgcagaagg cctccgcccc cgccgcggac 300 cctccgcggt acacctttgc acccagcgtc tccctcaaca agacggcccg gccctttggg 360 gcgcccccgc ccgctgacag cgccccgcaa cagaatggac agccgctccg accgctggtc 420 ccagatgcca gcaagcagcg gctgatggag aacacagagg actggcggcc gcggccgggg 480 acaggccagt cgcgttcctt ccgcatcctt gcccacctca caggcaccga gttcatgcaa 540 gacccggatg aggagcacct gaagaaatca agccaggtgc ccaggacaga agccccagcc 600 ccagcctcat ctacacccca ggagccctgg cctggcccta ccgcccccag ccctaccagc 660 cgcccgccct gggctgtgga ccctgcgttt gccgagcgct atgccccgga caaaacg 717 8 1488 DNA Homo sapiens 8 atcgatggcg agaatgcggg tagcctcaca cacatcgaag ctcagaacaa gatccgggcc 60 tgcggggagc gcctcagcct gggcctcagc agggcccagc cggttcagag caaaccgcag 120 aaggcctccg cccccgccgc ggaccctccg cggtacacct ttgcacccag cgtctccctc 180 aacaagacgg cccggccctt tggggcgccc ccgcccgctg acagcgcccc gcaacagaat 240 ggacagccgc tccgaccgct ggtcccagat gccagcaagc agcggctgat ggagaacaca 300 gaggactggc ggccgcggcc ggggacaggc cagtcgcgtt ccttccgcat ccttgcccac 360 ctcacaggca ccgagttcat gcaagacccg gatgaggagc acctgaagaa atcaagccag 420 gtgcccagga cagaagcccc agccccagcc tcatctacac cccaggagcc ctggcctggc 480 cctaccgccc ccagccctac cagccgcccg ccctgagctg tggaccctgc gtttgccgag 540 cgctatgccc cggacaaaac gagcacagtg ctgacccggc acagccagcc ggccacgccc 600 acgccgctgc agagccgcac ctccattgtg caggcagctg ccggaggggt gccaggaggg 660 ggcagcaaca acggcaagac tcccgtgtgt caccagtgcc acaaggtcat ccggggccgc 720 tacctggtgg cgttgggcca cgcgtaccac ccggaggagt ttgtgtgtag ccagtgtggg 780 aaggtcctgg aagagggtgg cttctttgag gagaagggcg ccatcttctg cccaccatgc 840 tatgacgtgc gctatgcacc cagctgtgcc aagtgcaaga agaagattac aggcgagatc 900 atgcacgccc tgaagatgac ctggcacgtg cactgcttta cctgtgctgc ctgcaagacg 960 cccatccgga acagggcctt ctacatggag gagggcgtgc cctattgcga gcgagactat 1020 gagaagatgt ttggcacgaa atgccatggc tgtgacttca agatcgacgc tggggaccgc 1080 ttcctggagg ccctgggctt cagctggcat gacacctgct tcgtctgtgc gatatgtcag 1140 atcaacctgg aaggaaagac cttctactcc aagaaggaca ggcctctctg caagagccat 1200 gccttctctc atgtgtgagc cccttctgcc cacagctgcc gcggtggccc ctagcctgag 1260 gggcctggag tcgtggccct gcatttctgg gtagggctgg caatggttgc cttaaccctg 1320 gctcctggcc cgagcctggg ctcccgggcc cctgcccacc caccttatcc tcccacccca 1380 ctccctccac caccacagca caccggtgct ggccacacca gccccctttc acctccagtg 1440 ccacaataaa cctgtaccca gctgaattcc aaaaaatcca aaaaaaaa 1488 9 1644 DNA Homo sapiens 9 atggattcct tcaaggtagt gctggagggg ccagcacctt ggggcttccg gctgcaaggg 60 ggcaaggact tcaatgtgcc cctctccatt tcccggctca ctcctggggg caaagcggcg 120 caggccggag tggccgtggg tgactgggtg ctgagcatcg atggcgagaa tgcgggtagc 180 ctcacacaca tcgaagctca gaacaagatc cgggcctgcg gggagcgcct cagcctgggc 240 ctcagcaggg cccagccggt tcagagcaaa ccgcagaagg cctccgcccc cgccgcggac 300 cctccgcggt acacctttgc acccagcgtc tccctcaaca agacggcccg gccctttggg 360 gcgcccccgc ccgctgacag cgccccgcaa cagaatggac agccgctccg accgctggtc 420 ccagatgcca gcaagcagcg gctgatggag aacacagagg actggcggcc gcggccgggg 480 acaggccagt cgcgttcctt ccgcatcctt gcccacctca caggcaccga gttcatgcaa 540 gacccggatg aggagcacct gaagaaatca agccaggtgc ccaggacaga agccccagcc 600 ccagcctcat ctacacccca ggagccctgg cctggcccta ccgcccccag ccctaccagc 660 cgcccgccct gggctgtgga ccctgcgttt gccgagcgct atgccccgga caaaacgagc 720 acagtgctga cccggcacag ccagccggcc acgcccacgc cgctgcagag ccgcacctcc 780 attgtgcagg cagctgccgg aggggtgcca ggagggggca gcaacaacgg caagactccc 840 gtgtgtcacc agtgccacaa ggtcatccgg ggccgctacc tggtggcgtt gggccacgcg 900 taccacccgg aggagtttgt gtgtagccag tgtgggaagg tcctggaaga gggtggcttc 960 tttgaggaga agggcgccat cttctgccca ccatgctatg acgtgcgcta tgcacccagc 1020 tgtgccaagt gcaagaagaa gattacaggc gagatcatgc acgccctgaa gatgacctgg 1080 cacgtgcact gctttacctg tgctgcctgc aagacgccca tccggaacag ggccttctac 1140 atggaggagg gcgtgcccta ttgcgagcga gactatgaga agatgtttgg cacgaaatgc 1200 catggctgtg acttcaagat cgacgctggg gaccgcttcc tggaggccct gggcttcagc 1260 tggcatgaca cctgcttcgt ctgtgcgata tgtcagatca acctggaagg aaagaccttc 1320 tactccaaga aggacaggcc tctctgcaag agccatgcct tctctcatgt gtgagcccct 1380 tctgcccaca gctgccgcgg tggcccctag cctgaggggc ctggagtcgt ggccctgcat 1440 ttctgggtag ggctggcaat ggttgcctta accctggctc ctggcccgag cctgggctcc 1500 cgggcccctg cccacccacc ttatcctccc accccactcc ctccaccacc acagcacacc 1560 ggtgctggcc acaccagccc cctttcacct ccagtgccac aataaacctg tacccagctg 1620 aattccaaaa aatccaaaaa aaaa 1644 10 457 PRT Homo sapiens 10 Met Asp Ser Phe Lys Val Val Leu Glu Gly Pro Ala Pro Trp Gly Phe 1 5 10 15 Arg Leu Gln Gly Gly Lys Asp Phe Asn Val Pro Leu Ser Ile Ser Arg 20 25 30 Leu Thr Pro Gly Gly Lys Ala Ala Gln Ala Gly Val Ala Val Gly Asp 35 40 45 Trp Val Leu Ser Ile Asp Gly Glu Asn Ala Gly Ser Leu Thr His Ile 50 55 60 Glu Ala Gln Asn Lys Ile Arg Ala Cys Gly Glu Arg Leu Ser Leu Gly 65 70 75 80 Leu Ser Arg Ala Gln Pro Val Gln Ser Lys Pro Gln Lys Ala Ser Ala 85 90 95 Pro Ala Ala Asp Pro Pro Arg Tyr Thr Phe Ala Pro Ser Val Ser Leu 100 105 110 Asn Lys Thr Ala Arg Pro Phe Gly Ala Pro Pro Pro Ala Asp Ser Ala 115 120 125 Pro Gln Gln Asn Gly Gln Pro Leu Arg Pro Leu Val Pro Asp Ala Ser 130 135 140 Lys Gln Arg Leu Met Glu Asn Thr Glu Asp Trp Arg Pro Arg Pro Gly 145 150 155 160 Thr Gly Gln Ser Arg Ser Phe Arg Ile Leu Ala His Leu Thr Gly Thr 165 170 175 Glu Phe Met Gln Asp Pro Asp Glu Glu His Leu Lys Lys Ser Ser Gln 180 185 190 Val Pro Arg Thr Glu Ala Pro Ala Pro Ala Ser Ser Thr Pro Gln Glu 195 200 205 Pro Trp Pro Gly Pro Thr Ala Pro Ser Pro Thr Ser Arg Pro Pro Trp 210 215 220 Ala Val Asp Pro Ala Phe Ala Glu Arg Tyr Ala Pro Asp Lys Thr Ser 225 230 235 240 Thr Val Leu Thr Arg His Ser Gln Pro Ala Thr Pro Thr Pro Leu Gln 245 250 255 Ser Arg Thr Ser Ile Val Gln Ala Ala Ala Gly Gly Val Pro Gly Gly 260 265 270 Gly Ser Asn Asn Gly Lys Thr Pro Val Cys His Gln Cys His Lys Val 275 280 285 Ile Arg Gly Arg Tyr Leu Val Ala Leu Gly His Ala Tyr His Pro Glu 290 295 300 Glu Phe Val Cys Ser Gln Cys Gly Lys Val Leu Glu Glu Gly Gly Phe 305 310 315 320 Phe Glu Glu Lys Gly Ala Ile Phe Cys Pro Pro Cys Tyr Asp Val Arg 325 330 335 Tyr Ala Pro Ser Cys Ala Lys Cys Lys Lys Lys Ile Thr Gly Glu Ile 340 345 350 Met His Ala Leu Lys Met Thr Trp His Val His Cys Phe Thr Cys Ala 355 360 365 Ala Cys Lys Thr Pro Ile Arg Asn Arg Ala Phe Tyr Met Glu Glu Gly 370 375 380 Val Pro Tyr Cys Glu Arg Asp Tyr Glu Lys Met Phe Gly Thr Lys Cys 385 390 395 400 His Gly Cys Asp Phe Lys Ile Asp Ala Gly Asp Arg Phe Leu Glu Ala 405 410 415 Leu Gly Phe Ser Trp His Asp Thr Cys Phe Val Cys Ala Ile Cys Gln 420 425 430 Ile Asn Leu Glu Gly Lys Thr Phe Tyr Ser Lys Lys Asp Arg Pro Leu 435 440 445 Cys Lys Ser His Ala Phe Ser His Val 450 455 11 22 DNA Artificial Sequence Sequencing Primer 11 gccagggttt tcccagtcac ga 22 12 22 DNA Artificial Sequence Sequencing Primer 12 gccagggttt tcccagtcac ga 22 13 22 DNA Homo sapiens 13 tcttagcaga gcccagcctg ct 22 14 22 DNA Homo sapiens 14 gcatgaactc tgtgcccgtg ag 22 15 20 DNA Rattus norvegicus 15 atccttgctc acctcacggg 20 16 22 DNA Rattus norvegicus 16 gcactgtgct ggttttgtct gg 22 17 23 DNA Homo sapiens 17 catggattcc ttcaaggtag tgc 23 18 20 DNA Homo sapiens 18 gttttgtctg gggcagagcg 20 19 44 DNA Artificial Sequence Sequencing Primer 19 ctaatacgac tcactatagg gctcgagcgg ccgcccgggc aggt 44 20 27 DNA Artificial Sequence Sequencing Primer 20 ccatcctaat acgactcact atagggc 27 21 765 DNA Homo sapiens 21 ccgttgtttg taaaacgacg cagagcagcg ccctggccgg gccaagcagg agccggcatc 60 atggattcct tcaaggtagt gctggagggg ccagcacctt ggggcttccg gctgcaaggg 120 ggcaaggact tcaatgtgcc ctcctccatt tcccggctca cctctggggg caaggccgtg 180 caggccggag tggccgtaag tgactgggtg ctgagcatcg atggcgagaa tgcgggtagc 240 ctcacacaca tcgaagctca gaacaagatc cgggcctgcg gggagcgcct cagcctgggc 300 ctcaacaggg cccagccggt tcagaacaaa ccgcaaaagg cctccgcccc cgccgcggac 360 cctccgcggt acacctttgc accaagcgtc tccctcaaca agacggcccg gcccttgggg 420 gcgcccccgc ccgctgacag cgccccgcag cagaatggac agccgctccg accgctggtc 480 ccagatgcca gcaagcagcg gctgatggag aacacagagg actggcggcc gcggccgggg 540 acaggccagt gccgttcctt tcgcatcctt gctcacctta caggcaccga gttcatgcaa 600 gacccggatg aggagcacct gaagaaatca agccaggtgc ccaggacaga agccccagcc 660 ccagcctcat ctacacccca ggagccctgg cctggcccta ccgcccccag ccctaccagc 720 cgcccgccct gggctgtgga ccctgcgttt gccgagcgct atgcc 765 22 1689 DNA Homo sapiens 22 cgacgcagag cagcgccctg gccgggccaa gcaggagccg gcatcatgga ttccttcaag 60 gtagtgctgg aggggccagc accttggggc ttccggctgc aagggggcaa ggacttcaat 120 gtgcccctct ccatttcccg gctcactcct gggggcaaag cggcgcaggc cggagtggcc 180 gtgggtgact gggtgctgag catcgatggc gagaatgcgg gtagcctcac acacatcgaa 240 gctcagaaca agatccgggc ctgcggggag cgcctcagcc tgggcctcag cagggcccag 300 ccggttcaga gcaaaccgca gaaggcctcc gcccccgccg cggaccctcc gcggtacacc 360 tttgcaccca gcgtctccct caacaagacg gcccggccct ttggggcgcc cccgcccgct 420 gacagcgccc cgcaacagaa tggacagccg ctccgaccgc tggtcccaga tgccagcaag 480 cagcggctga tggagaacac agaggactgg cggccgcggc cggggacagg ccagtcgcgt 540 tccttccgca tccttgccca cctcacaggc accgagttca tgcaagaccc ggatgaggag 600 cacctgaaga aatcaagcca ggtgcccagg acagaagccc cagccccagc ctcatctaca 660 ccccaggagc cctggcctgg ccctaccgcc cccagcccta ccagccgccc gccctgggct 720 gtggaccctg cgtttgccga gcgctatgcc ccggacaaaa cgagcacagt gctgacccgg 780 cacagccagc cggccacgcc cacgccgctg cagagccgca cctccattgt gcaggcagct 840 gccggagggg tgccaggagg gggcagcaac aacggcaaga ctcccgtgtg tcaccagtgc 900 cacaaggtca tccggggccg ctacctggtg gcgttgggcc acgcgtacca cccggaggag 960 tttgtgtgta gccagtgtgg gaaggtcctg gaagagggtg gcttctttga ggagaagggc 1020 gccatcttct gcccaccatg ctatgacgtg cgctatgcac ccagctgtgc caagtgcaag 1080 aagaagatta caggcgagat catgcacgcc ctgaagatga cctggcacgt gcactgcttt 1140 acctgtgctg cctgcaagac gcccatccgg aacagggcct tctacatgga ggagggcgtg 1200 ccctattgcg agcgagacta tgagaagatg tttggcacga aatgccatgg ctgtgacttc 1260 aagatcgacg ctggggaccg cttcctggag gccctgggct tcagctggca tgacacctgc 1320 ttcgtctgtg cgatatgtca gatcaacctg gaaggaaaga ccttctactc caagaaggac 1380 aggcctctct gcaagagcca tgccttctct catgtgtgag ccccttctgc ccacagctgc 1440 cgcggtggcc cctagcctga ggggcctgga gtcgtggccc tgcatttctg ggtagggctg 1500 gcaatggttg ccttaaccct ggctcctggc ccgagcctgg gctcccgggc ccctgcccac 1560 ccaccttatc ctcccacccc actccctcca ccaccacagc acaccggtgc tggccacacc 1620 agcccccttt cacctccagt gccacaataa acctgtaccc agctgaattc caaaaaatcc 1680 aaaaaaaaa 1689 23 22 DNA Homo sapiens 23 gcactgtgct cgttttgtcc gg 22 24 21 DNA Homo sapiens 24 tccttgctca cctcacgggc a 21 25 30 DNA Homo sapiens 25 tcctcatccg ggtcttgcat gaactcggtg 30 26 28 DNA Homo sapiens Sequencing primer 26 gcccccgccc gctgacagcg ccccgcaa 28 27 24 DNA Homo sapiens 27 tccttgctca cctcacgggc accg 24 28 22 DNA Artificial Sequence Sequencing Primer 28 gtaatacgac tcactatagg gc 22 29 23 DNA Rattus norvegicus 29 gcggctgatg gagaatactg aag 23 30 23 DNA Rattus norvegicus 30 atcttgtggc actggtggca tac 23 31 22 DNA Rattus norvegicus 31 tgtgtcgggt cagcactgtg ct 22 32 1620 DNA Homo sapiens 32 atggattcct tcaaggtagt gctggagggg ccagcacctt ggggcttccg gctgcaaggg 60 ggcaaggact tcaatgtgcc cctctccatt tcccggctca ctcctggggg caaagcggcg 120 caggccggag tggccgtggg tgactgggtg ctgagcatcg atggcgagaa tgcgggtagc 180 ctcacacaca tcgaagctca gaacaagatc cgggcctgcg gggagcgcct cagcctgggc 240 ctcagcaggg cccagccggt tcagagcaaa ccgcagaagg cctccgcccc cgccgcggac 300 cctccgcggt acacctttgc acccagcgtc tccctcaaca agacggcccg gccctttggg 360 gcgcccccgc ccgctgacag cgccccgcaa cagaatggac agccgctccg accgctggtc 420 ccagatgcca gcaagcagcg gctgatggag aacacagagg actggcggcc gcggccgggg 480 acaggccagt cgcgttcctt ccgcatcctt gcccacctca caggcaccga gttcatgcaa 540 gacccggatg aggagcacct gaagaaatca agccaggtgc ccaggacaga agccccagcc 600 ccagcctcat ctacacccca ggagccctgg cctggcccta ccgcccccag ccctaccagc 660 cgcccgccct gagctgtgga ccctgcgttt gccgagcgct atgccccgga caaaacgagc 720 acagtgctga cccggcacag ccagccggcc acgcccacgc cgctgcagag ccgcacctcc 780 attgtgcagg cagctgccgg aggggtgcca ggagggggca gcaacaacgg caagactccc 840 gtgtgtcacc agtgccacaa ggtcatccgg ggccgctacc tggtggcgtt gggccacgcg 900 taccacccgg aggagtttgt gtgtagccag tgtgggaagg tcctggaaga gggtggcttc 960 tttgaggaga agggcgccat cttctgccca ccatgctatg acgtgcgcta tgcacccagc 1020 tgtgccaagt gcaagaagaa gattacaggc gagatcatgc acgccctgaa gatgacctgg 1080 cacgtgcact gctttacctg tgctgcctgc aagacgccca tccggaacag ggccttctac 1140 atggaggagg gcgtgcccta ttgcgagcga gactatgaga agatgtttgg cacgaaatgc 1200 catggctgtg acttcaagat cgacgctggg gaccgcttcc tggaggccct gggcttcagc 1260 tggcatgaca cctgcttcgt ctgtgcgata tgtcagatca acctggaagg aaagaccttc 1320 tactccaaga aggacaggcc tctctgcaag agccatgcct tctctcatgt gtgagcccct 1380 tctgcccaca gctgccgcgg tggcccctag cctgaggggc ctggagtcgt ggccctgcat 1440 ttctgggtag ggctggcaat ggttgcctta accctggctc ctggcccgag cctgggctcc 1500 cgggcccctg cccacccacc ttatcctccc accccactcc ctccaccacc acagcacacc 1560 ggtgctggcc acaccagccc cctttcacct ccagtgccac aataaacctg tacccagctg 1620 33 1665 DNA Homo sapiens 33 cgacgcagag cagcgccctg gccgggccaa gcaggagccg gcatcatgga ttccttcaag 60 gtagtgctgg aggggccagc accttggggc ttccggctgc aagggggcaa ggacttcaat 120 gtgcccctct ccatttcccg gctcactcct gggggcaaag cggcgcaggc cggagtggcc 180 gtgggtgact gggtgctgag catcgatggc gagaatgcgg gtagcctcac acacatcgaa 240 gctcagaaca agatccgggc ctgcggggag cgcctcagcc tgggcctcag cagggcccag 300 ccggttcaga gcaaaccgca gaaggcctcc gcccccgccg cggaccctcc gcggtacacc 360 tttgcaccca gcgtctccct caacaagacg gcccggccct ttggggcgcc cccgcccgct 420 gacagcgccc cgcaacagaa tggacagccg ctccgaccgc tggtcccaga tgccagcaag 480 cagcggctga tggagaacac agaggactgg cggccgcggc cggggacagg ccagtcgcgt 540 tccttccgca tccttgccca cctcacaggc accgagttca tgcaagaccc ggatgaggag 600 cacctgaaga aatcaagcca ggtgcccagg acagaagccc cagccccagc ctcatctaca 660 ccccaggagc cctggcctgg ccctaccgcc cccagcccta ccagccgccc gccctgagct 720 gtggaccctg cgtttgccga gcgctatgcc ccggacaaaa cgagcacagt gctgacccgg 780 cacagccagc cggccacgcc cacgccgctg cagagccgca cctccattgt gcaggcagct 840 gccggagggg tgccaggagg gggcagcaac aacggcaaga ctcccgtgtg tcaccagtgc 900 cacaaggtca tccggggccg ctacctggtg gcgttgggcc acgcgtacca cccggaggag 960 tttgtgtgta gccagtgtgg gaaggtcctg gaagagggtg gcttctttga ggagaagggc 1020 gccatcttct gcccaccatg ctatgacgtg cgctatgcac ccagctgtgc caagtgcaag 1080 aagaagatta caggcgagat catgcacgcc ctgaagatga cctggcacgt gcactgcttt 1140 acctgtgctg cctgcaagac gcccatccgg aacagggcct tctacatgga ggagggcgtg 1200 ccctattgcg agcgagacta tgagaagatg tttggcacga aatgccatgg ctgtgacttc 1260 aagatcgacg ctggggaccg cttcctggag gccctgggct tcagctggca tgacacctgc 1320 ttcgtctgtg cgatatgtca gatcaacctg gaaggaaaga ccttctactc caagaaggac 1380 aggcctctct gcaagagcca tgccttctct catgtgtgag ccccttctgc ccacagctgc 1440 cgcggtggcc cctagcctga ggggcctgga gtcgtggccc tgcatttctg ggtagggctg 1500 gcaatggttg ccttaaccct ggctcctggc ccgagcctgg gctcccgggc ccctgcccac 1560 ccaccttatc ctcccacccc actccctcca ccaccacagc acaccggtgc tggccacacc 1620 agcccccttt cacctccagt gccacaataa acctgtaccc agctg 1665 34 223 PRT Homo sapiens 34 Met Asp Ser Phe Lys Val Val Leu Glu Gly Pro Ala Pro Trp Gly Phe 1 5 10 15 Arg Leu Gln Gly Gly Lys Asp Phe Asn Val Pro Leu Ser Ile Ser Arg 20 25 30 Leu Thr Pro Gly Gly Lys Ala Ala Gln Ala Gly Val Ala Val Gly Asp 35 40 45 Trp Val Leu Ser Ile Asp Gly Glu Asn Ala Gly Ser Leu Thr His Ile 50 55 60 Glu Ala Gln Asn Lys Ile Arg Ala Cys Gly Glu Arg Leu Ser Leu Gly 65 70 75 80 Leu Ser Arg Ala Gln Pro Val Gln Ser Lys Pro Gln Lys Ala Ser Ala 85 90 95 Pro Ala Ala Asp Pro Pro Arg Tyr Thr Phe Ala Pro Ser Val Ser Leu 100 105 110 Asn Lys Thr Ala Arg Pro Phe Gly Ala Pro Pro Pro Ala Asp Ser Ala 115 120 125 Pro Gln Gln Asn Gly Gln Pro Leu Arg Pro Leu Val Pro Asp Ala Ser 130 135 140 Lys Gln Arg Leu Met Glu Asn Thr Glu Asp Trp Arg Pro Arg Pro Gly 145 150 155 160 Thr Gly Gln Ser Arg Ser Phe Arg Ile Leu Ala His Leu Thr Gly Thr 165 170 175 Glu Phe Met Gln Asp Pro Asp Glu Glu His Leu Lys Lys Ser Ser Gln 180 185 190 Val Pro Arg Thr Glu Ala Pro Ala Pro Ala Ser Ser Thr Pro Gln Glu 195 200 205 Pro Trp Pro Gly Pro Thr Ala Pro Ser Pro Thr Ser Arg Pro Pro 210 215 220 35 25 DNA Rattus norvegicus 35 gcactacctt gaaggaatcc atggt 25 36 6 PRT Rattus norvegicus 36 Gln Asp Pro Asp Glu Glu 1 5 

We claim:
 1. An isolated nucleic acid molecule comprising a nucleotide sequence encoding human LMP, wherein the nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO: 25, and wherein the molecule hybridizes under highly stringent conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 26. 2. The isolated nucleic acid molecule according to claim 1, wherein the isolated nucleic acid molecule is HLMP-1s which comprises SEQ ID NO:
 33. 3. The isolated nucleic acid molecule according to claim 1, wherein the isolated nucleic acid molecule is HLMP-1 which comprises SEQ ID NO:
 22. 4. A human LMP protein encoded by an isolated nucleic acid molecule, wherein the nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO: 25, and wherein the molecule hybridizes under highly stringent conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 26. 5. The human LMP protein according to claim 4, comprising the amino acid sequence of SEQ ID NO:
 34. 6. An isolated nucleic acid molecule comprising a nucleotide sequence encoding rat LMP protein, wherein the isolated nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 2. 7. A rat LMP protein encoded by an isolated nucleic acid molecule, wherein the isolated nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 2. 8. A vector comprising the isolated nucleic acid molecule of any of claims 1, 2, 3 or
 6. 9. A host cell comprising the vector of claim 8, wherein the host cell is selected from the group consisting of procaryotic cells, yeast cells and mammalian cells.
 10. The isolated nucleic acid molecule of any of claims 1, 2, 3 or 6, further comprising a label for detection.
 11. A human LIM mineralization protein comprising an amino acid sequence selected from the group consisting of SEQ ID NO: 10 and SEQ ID NO:
 34. 12. A rat LIM mineralization protein comprising the amino acid sequence of SEQ ID NO:
 1. 13. An osteoinductive soluble factor induced by the expression of human LIM mineralization protein.
 14. The osteoinductive soluble factor of claim 13, wherein the osteoinductive soluble factor is a protein.
 15. A monoclonal antibody specific for a human LIM mineralization protein.
 16. The monoclonal antibody of claim 15, wherein the human LIM mineralization protein is HLMP-1 (SEQ ID NO: 10).
 17. The monoclonal antibody of claim 15, wherein the human LIM mineralization protein is HLMP-1s (SEQ ID NO: 34).
 18. A polyclonal antibody specific for a human LIM mineralization protein.
 19. The polyclonal antibody of claim 18, wherein the human LIM mineralization protein is HLMP-1 (SEQ ID NO: 10).
 20. The polyclonal antibody of claim 18, wherein the human LIM mineralization protein is HLMP-1s (SEQ ID NO: 34).
 21. A monoclonal antibody specific for a rat LIM mineralization protein (SEQ ID NO: 1).
 22. A polyclonal antibody specific for a rat LIM mineralization protein (SEQ ID NO: 1).
 23. A method of inducing bone formation comprising transfecting osteogenic precursor cells with an isolated nucleic acid molecule comprising a nucleotide sequence encoding LIM mineralization protein.
 24. The method of claim 23, wherein the isolated nucleic acid molecule is in a vector.
 25. The method of claim 24, wherein the vector is an expression vector.
 26. The method of claim 25, wherein the vector is a plasmid.
 27. The method of claim 25, wherein the vector is a virus.
 28. The method of claim 27, wherein the virus is an adenovirus
 29. The method of claim 27, wherein the virus is a retrovirus.
 30. The method of claim 23, wherein the osteogenic precursor cells are transfected ex vivo.
 31. The method of claim 23, wherein the osteogenic precursor cells are transfected in vivo by direct injection of the isolated nucleic acid molecule.
 32. The method of claim 23, wherein the LIM mineralization protein is HLMP-1 (SEQ ID NO: 10).
 33. The method of claim 23, wherein the LIM mineralization protein is HLMP-1s (SEQ ID NO: 34).
 34. The method of claim 23, wherein the LIM mineralization protein is RLMP (SEQ ID NO: 1).
 35. A method of fusing a spine, comprising: (a) transfecting osteogenic precursor cells with an isolated nucleic acid molecule comprising a nucleotide sequence encoding LIM mineralization protein; (b) admixing the transfected osteogenic precursor cells with a matrix; and (c) contacting the matrix with the spine; wherein expression of the nucleotide sequence encoding LIM mineralization protein causes mineralized bone formation in the matrix.
 36. The method of claim 35, wherein the osteogenic precursor cells are transfected ex vivo.
 37. The method of claim 35, wherein the LIM mineralization protein is selected from the group consisting of HLMP-1 (SEQ ID NO: 10), HLMP-1s (SEQ ID NO: 34) and RLMP (SEQ ID NO: 1).
 38. A method of inducing systemic bone formation in a mammalian host in need thereof, comprising: (a) transfecting osteogenic precursor cells with a vector that is stablely maintained in the osteogenic precursor cells, the vector comprising a nucleotide sequence encoding a LIM mineralization protein and a regulatable promoter, wherein the regulatable promoter, which responds to an exogenous control compound, controls expression of the nucleotide sequence encoding the LIM mineralization protein; and (b) administering to the host, as needed, an amount of the exogenous control substance effective to cause expression of the nucleotide sequence encoding a LIM mineralization protein.
 39. The method of claim 38, wherein the LIM mineralization protein is selected from the group consisting of HLMP-1 (SEQ ID NO: 10), HLMP-1s (SEQ ID NO: 34) and RLMP (SEQ ID NO: 1).
 40. A method of stimulating production of an osteogenic soluble factor by an osteogenic cell, comprising: (a) transfecting the osteogenic cell with an isolated nucleic acid molecule comprising a nucleotide sequence encoding LIM mineralization protein; and (b) overexpressing the isolated nucleic acid molecule.
 41. An osteogenic soluble factor produced by the method of claim
 40. 42. The osteogenic soluble factor of claim 41, wherein the osteogenic factor is a protein.
 43. A method of inhibiting the expression of LIM mineralization protein comprising transfecting a cell wherein the LIM mineralization protein is expressed with an antisense oligonucleotide.
 44. The method of claim 43, wherein the antisense oligonucleotide has the nucleotide sequence set forth in SEQ ID NO:
 35. 45. An isolated nucleic acid molecule comprising a nucleotide sequence encoding human LMP, wherein the nucleic acid molecule hybridizes under standard conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 25. 46. An isolated nucleic acid molecule comprising a nucleotide sequence encoding human LMP, wherein the nucleic acid molecule hybridizes under highly stringent conditions to a nucleic acid molecule complementary to the full length of SEQ. ID NO:
 26. 47. The method of claim of claim 31, wherein the isolated nucleic acid molecule is in a vector selected from the group consisting of a plasmid and a virus.
 48. The method of claim 47, wherein the vector is a plasmid, which plasmid is directly injected into muscle tissue. 